Add PR link to SwiftLexicalLookup release notes entry.

Author: MAJKFL

Release Notes/602.md

@@ -4,7 +4,7 @@
 
 - `SwiftLexicalLookup` - A new Swift unqualified lookup library
   - Description: The library provides a new Swift unqualified lookup implementation detached from the compiler and accessible to outside clients. The query is stateless and can be directly run on swift-syntax syntax tree, with any syntax node functioning as an entry point. It produces an enum-based data structure as a result that partitions collected names based on the lexical scope of introduction. 
-  - Pull Request: *Link to the pull request(s) that introduces this change*
+  - Pull Request: https://github.com/swiftlang/swift-syntax/pull/2952
   - Notes: The library follows the behavior of the compiler implementation with some minor differences, such as a different way of handling dollar identifiers `$x` and generic parameters inside extensions. Furthermore, in the future, once the compiler adopts `SwiftLexicalLookup` and it becomes the canonical implementation, results produced by the query will be guaranteed to be correct.
 
 ## API Behavior Changes