refactor(mac): converge the docs of AspectRatio to the Windows text

Same two variant docs as in the KDE revision before: 'A predefined aspect ratio' and 'A custom W:H aspect ratio' become the Windows 'Predefined aspect ratio' and 'Custom W:H aspect ratio'.

Schema: komorebi-for-mac/schema.json cannot be regenerated on this host, so the two description lines were edited to the text of the doc comments; the file equals the old one after deleting every description (jq walk), so description-only. The next revisions compare the generated definitions of the shared crate with this file.

Verified: jq description-only comparison (4 changed lines). Doc comments only: no compile needed, not run.

komorebi-for-mac/komorebi/src/window.rs

@@ -1597,10 +1597,10 @@ impl From<&CFDictionary> for WindowBounds {
 #[serde(untagged)]
 /// Aspect ratio for temporarily floating windows
 pub enum AspectRatio {
-    /// A predefined aspect ratio
+    /// Predefined aspect ratio
     #[cfg_attr(feature = "schemars", schemars(title = "Predefined"))]
     Predefined(PredefinedAspectRatio),
-    /// A custom W:H aspect ratio
+    /// Custom W:H aspect ratio
     #[cfg_attr(feature = "schemars", schemars(title = "Custom"))]
     Custom(i32, i32),
 }

komorebi-for-mac/schema.json

@@ -639,12 +639,12 @@
       "anyOf": [
         {
           "title": "Predefined",
-          "description": "A predefined aspect ratio",
+          "description": "Predefined aspect ratio",
           "$ref": "#/$defs/PredefinedAspectRatio"
         },
         {
           "title": "Custom",
-          "description": "A custom W:H aspect ratio",
+          "description": "Custom W:H aspect ratio",
           "type": "array",
           "maxItems": 2,
           "minItems": 2,