Updated RegexExtended (markdown)

RegexExtended.md

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+# Info
+
+The [RegexMatcher](https://github.com/WireMock-Net/WireMock.Net/wiki/Request-Matching#regular-expression-matching-regexmatcher) can use:
+- RegexExtended (default)
+- [Regex](https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex?view=net-6.0)
+
+## RegexExtended 
+Extension to the Regex object, adding support for GUID tokens for matching on.
+Example:
+When using this `\guidb` as regualar expression, you can match on a GUID(B).