Remove abstract properties (#1781)

pkl-doc/src/test/files/DocGeneratorTest/input/com.package1/classInheritance.pkl

@@ -3,7 +3,7 @@ module com.package1.classInheritance
 
 abstract class MyClass1 {
   /// Inherited property comment.
-  abstract property1: Boolean
+  property1: Boolean
 
   /// function method1 in class MyClass1.
   abstract function method1(arg: String): Boolean

pkl-doc/src/test/files/DocGeneratorTest/input/com.package1/classPropertyModifiers.pkl

@@ -8,9 +8,6 @@ abstract class Modifiers {
   /// Property with `hidden` modifier.
   hidden property2: Float = 3.14159265359
 
-  /// Property with `abstract` modifier.
-  abstract property3: Float
-
   /// Property with multiple modifiers.
   abstract hidden property4: Float
 

pkl-doc/src/test/files/DocGeneratorTest/input/com.package1/modulePropertyModifiers.pkl

@@ -10,10 +10,4 @@ hidden property2: Float = 3.14159265359
 /*
 /// Property with `external` modifier.
 external property3: Float
-
-/// Property with `abstract` modifier.
-abstract property4: Float
-
-/// Property with multiple modifiers.
-abstract external hidden property5: Float
 */

pkl-doc/src/test/files/DocGeneratorTest/output/run-1/com.package1/1.2.3/classInheritance/MyClass1.html

@@ -50,7 +50,7 @@
             <div id="property1" class="anchor"> </div>
             <div class="member"><a class="member-selflink material-icons" href="#property1">link</a>
               <div class="member-left">
-                <div class="member-modifiers">abstract </div>
+                <div class="member-modifiers"></div>
               </div>
               <div class="member-main">
                 <div class="member-signature"><span class="name-decl">property1</span>: <a href="https://pages.github.com/apple/pkl/stdlib/pkl/0.24.0/base/Boolean.html" class="name-ref">Boolean</a><a class="member-source-link" href="https://example.com/package1/classInheritance.pkl#L123-L456">Source</a></div>

pkl-doc/src/test/files/DocGeneratorTest/output/run-1/com.package1/1.2.3/classPropertyModifiers/Modifiers.html

@@ -58,23 +58,11 @@
               </div>
             </div>
           </li>
-          <li>
-            <div id="property3" class="anchor"> </div>
-            <div class="member"><a class="member-selflink material-icons" href="#property3">link</a>
-              <div class="member-left">
-                <div class="member-modifiers">abstract </div>
-              </div>
-              <div class="member-main">
-                <div class="member-signature"><span class="name-decl">property3</span>: <a href="https://pages.github.com/apple/pkl/stdlib/pkl/0.24.0/base/Float.html" class="name-ref">Float</a><a class="member-source-link" href="https://example.com/package1/classPropertyModifiers.pkl#L123-L456">Source</a></div>
-                <div class="doc-comment"><p>Property with <code>abstract</code> modifier.</p></div>
-              </div>
-            </div>
-          </li>
           <li>
             <div id="property4" class="anchor"> </div>
             <div class="member hidden-member"><a class="member-selflink material-icons" href="#property4">link</a>
               <div class="member-left">
-                <div class="member-modifiers">abstract hidden </div>
+                <div class="member-modifiers">hidden </div>
               </div>
               <div class="member-main">
                 <div class="member-signature"><span class="name-decl">property4</span>: <a href="https://pages.github.com/apple/pkl/stdlib/pkl/0.24.0/base/Float.html" class="name-ref">Float</a><a class="member-source-link" href="https://example.com/package1/classPropertyModifiers.pkl#L123-L456">Source</a></div>

pkl-doc/src/test/files/DocGeneratorTest/output/run-2/com.package1/1.2.3/classInheritance/MyClass1.html

@@ -50,7 +50,7 @@
             <div id="property1" class="anchor"> </div>
             <div class="member"><a class="member-selflink material-icons" href="#property1">link</a>
               <div class="member-left">
-                <div class="member-modifiers">abstract </div>
+                <div class="member-modifiers"></div>
               </div>
               <div class="member-main">
                 <div class="member-signature"><span class="name-decl">property1</span>: <a href="https://pages.github.com/apple/pkl/stdlib/pkl/0.24.0/base/Boolean.html" class="name-ref">Boolean</a><a class="member-source-link" href="https://example.com/package1/classInheritance.pkl#L123-L456">Source</a></div>

pkl-doc/src/test/files/DocGeneratorTest/output/run-2/com.package1/1.2.3/classPropertyModifiers/Modifiers.html

@@ -58,23 +58,11 @@
               </div>
             </div>
           </li>
-          <li>
-            <div id="property3" class="anchor"> </div>
-            <div class="member"><a class="member-selflink material-icons" href="#property3">link</a>
-              <div class="member-left">
-                <div class="member-modifiers">abstract </div>
-              </div>
-              <div class="member-main">
-                <div class="member-signature"><span class="name-decl">property3</span>: <a href="https://pages.github.com/apple/pkl/stdlib/pkl/0.24.0/base/Float.html" class="name-ref">Float</a><a class="member-source-link" href="https://example.com/package1/classPropertyModifiers.pkl#L123-L456">Source</a></div>
-                <div class="doc-comment"><p>Property with <code>abstract</code> modifier.</p></div>
-              </div>
-            </div>
-          </li>
           <li>
             <div id="property4" class="anchor"> </div>
             <div class="member hidden-member"><a class="member-selflink material-icons" href="#property4">link</a>
               <div class="member-left">
-                <div class="member-modifiers">abstract hidden </div>
+                <div class="member-modifiers">hidden </div>
               </div>
               <div class="member-main">
                 <div class="member-signature"><span class="name-decl">property4</span>: <a href="https://pages.github.com/apple/pkl/stdlib/pkl/0.24.0/base/Float.html" class="name-ref">Float</a><a class="member-source-link" href="https://example.com/package1/classPropertyModifiers.pkl#L123-L456">Source</a></div>