help: adding a help category to narrow and remotefilelog commands

Differential Revision: https://phab.mercurial-scm.org/D6998

hgext/narrow/narrowcommands.py

@@ -445,6 +445,7 b' def _widen('
     + commands.remoteopts,
     _(b'[OPTIONS]... [REMOTE]'),
     inferrepo=True,
+    helpcategory=command.CATEGORY_MAINTENANCE,
 )
 def trackedcmd(ui, repo, remotepath=None, *pats, **opts):
     """show or change the current narrowspec

hgext/remotefilelog/__init__.py

@@ -1234,6 +1234,7 b' def resolveprefetchopts(ui, opts):'
     ]
     + commands.walkopts,
     _(b'hg prefetch [OPTIONS] [FILE...]'),
+    helpcategory=command.CATEGORY_MAINTENANCE,
 )
 def prefetch(ui, repo, *pats, **opts):
     """prefetch file revisions from the server