Update .chloggen/rpc-metadata.yaml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: trask

.chloggen/rpc-metadata.yaml

@@ -2,6 +2,6 @@ change_type: breaking
 component: rpc
 note: |
   Rename
-  - `rpc.grpc.request.metadata` and  `rpc.connect_rpc.request.metadata` to  `rpc.request.metadata`
+  - `rpc.grpc.request.metadata` and `rpc.connect_rpc.request.metadata` to `rpc.request.metadata`
   - `rpc.grpc.response.metadata` and `rpc.connect_rpc.response.metadata` to `rpc.response.metadata`
 issues: [2869, 3169]