Merge branch 'docs-vale-needto' into 'master'

Add need to in Vale substitution warning

See merge request gitlab-org/gitlab!67886

doc/.vale/gitlab/SubstitutionWarning.yml

@@ -17,6 +17,7 @@ swap:
   file name: filename
   filesystem: file system
   info: information
+  need to: must
   repo: repository
   timezone: time zone
   utilize: use