Update misc/memory-connection-limits/CHANGELOG.md

Author: jxs

misc/memory-connection-limits/CHANGELOG.md

@@ -1,7 +1,7 @@
 ## 0.5.1
 
 - fix limit checking according to documentation, limit should be reached not exceeded.
-  See [PR XXXX](https://github.com/libp2p/rust-libp2p/pull/XXXX).
+  See [PR 6134](https://github.com/libp2p/rust-libp2p/pull/6134).
 ## 0.5.0
 
 <!-- Update to libp2p-swarm v0.47.0 -->