keyword: reformat kwfiles help for minirst parser

hgext/keyword.py

@@ -372,7 +372,8 def files(ui, repo, *pats, **opts):
     Use -u/--untracked to list untracked files as well.
 
     With -a/--all and -v/--verbose the codes used to show the status of files
-    are:
+    are::
+
     K = keyword expansion candidate
     k = keyword expansion candidate (untracked)
     I = ignored