Fix dead case studies link in Rich_Client_Platform.md

Co-authored-by: laeubi <[email protected]>

Author: Copilot

docs/Rich_Client_Platform.md

@@ -14,7 +14,7 @@ For more details on what is included in the Rich Client Platform, see the [RCP F
 Case Studies
 ------------
 
-The Eclipse community has put together a set of [case studies](https://www.eclipse.org/community/rcpcp.php) highlighting the use of RCP technology in a variety of real-world settings. 
+The Eclipse community has put together a set of [case studies](https://www.eclipse.org/community/) highlighting the use of RCP technology in a variety of real-world settings. 
 More are being added all the time so visit page from time to time to see what's new.
 
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