add branch to RFC5

Author: tomkralidis

docs/development/rfc/5.md

@@ -58,6 +58,7 @@ Documentation will be added to the configuration description page.
 ## Issues and Pull Request tracking
 
 Issue: https://github.com/geopython/pygeoapi/issues/1856
+Branch: https://github.com/geopython/pygeoapi/tree/limits
 Pull Request: TBD
 
 ## Voting History