Updates to N&N for CDT 11.1 release

Part of #202

NewAndNoteworthy/CDT-11.1.md

@@ -6,15 +6,18 @@ This is the New & Noteworthy page for CDT 11.1 which is part of Eclipse 2023-03
 
 # Release Notes
 
+# C++ Language support
 
+Numerous improvements to C++ language support have [been implemented for CDT 11.1](https://github.com/eclipse-cdt/cdt/pulls?q=is%3Apr+is%3Aclosed+label%3Alanguage+milestone%3A11.1.0).
 
 # API Changes, current and planned
 
 Please see [CHANGELOG-API](CHANGELOG-API.md) for details on the breaking API changes in this release as well as future planned API changes.
 
 ## GCCToolchain allows custom parsing of `#define` lines
 
-See new method `matchDefines` introduced in `GCCToolChain`.
+See new method [`matchDefines` introduced in `GCCToolChain`](https://github.com/eclipse-cdt/cdt/blob/920f7d85a56bf60e9e5befeea42779bf9b4021d2/build/org.eclipse.cdt.build.gcc.core/src/org/eclipse/cdt/build/gcc/core/GCCToolChain.java#L537-L552).
+
 # Noteworthy Issues and Pull Requests
 
 See [Noteworthy issues and PRs](https://github.com/eclipse-cdt/cdt/issues?q=is%3Aclosed+label%3Anoteworthy+milestone%3A11.1.0) for this release in the issue/PR tracker.