Merge pull request InsightSoftwareConsortium#5139 from thewtex/release-branches-doc-for-release

DOC: Update maintenance branch for 5.4 series

Author: thewtex

Documentation/docs/contributing/index.md

@@ -379,10 +379,7 @@ branches:
   * `release`: Maintenance of latest release
   * `release-3.20`: Maintenance of the ITKv3 series
   * `release-4.13`: Maintenance of the ITKv4 series
-  * `5.4`: Maintenance of the ITKv5 series.
-    - The naming convention changed to support ReadTheDocs rendering of
-      versions on docs.itk.org
-    - Future releases, `6.0`, `6.1`, etc. should use this convention.
+  * `release-5.4`: Maintenance of the ITKv5 series.
   * `nightly-master`: Follows master, updated at 01:00 UTC for nightly dashboard build consistency.
   * `hooks`: Local commit hooks (place in `.git/hooks`)
   * `dashboard`: Dashboard script (setup a CDash client)