docs: capitalize headers for consistency

docs/changelogs/v0.23.md

@@ -14,7 +14,7 @@
   - [Trustless Gateway Over Libp2p Experiment](#trustless-gateway-over-libp2p-experiment)
   - [Removal of `/quic` (Draft 29) support](#removal-of-quic-draft-29-support)
   - [Better Caching of multiaddresses for providers in DHT servers](#better-caching-of-multiaddresses-for-providers-in-dht-servers)
-  - [fixed FUSE multiblock structures](#fixed-fuse-multiblock-structures)
+  - [Fixed FUSE multiblock structures](#fixed-fuse-multiblock-structures)
 - [📝 Changelog](#-changelog)
 - [👨‍👩‍👧‍👦 Contributors](#-contributors)
 
@@ -116,7 +116,7 @@ In most cases this enables skipping a second query which resolves the peer id to
 
 This will improve content fetching lantency in the network overtime as servers updates.
 
-#### fixed FUSE multiblock structures
+#### Fixed FUSE multiblock structures
 
 `ls`ing directories and reading dag-pb files on a fuse volume have been fixed. [#9044](https://github.com/ipfs/kubo/issues/9044)
 Thx a lot @bmwiedemann for debugging this issue.