tests/test-nested-repo.t

hgrc.5: drop 'hgext.' prefix when talking about extensions

The first paragraph apply to all extensions, not just those in hgext.
The second paragraph can just use the simpler form to load mq.

  $ hg init a
  $ cd a
  $ hg init b
  $ echo x > b/x

Should print nothing:

  $ hg add b
  $ hg st

Should fail:

  $ hg st b/x
  abort: path 'b/x' is inside repo 'b'
  [255]
  $ hg add b/x
  abort: path 'b/x' is inside repo 'b'
  [255]

Should fail:

  $ hg add b b/x
  abort: path 'b/x' is inside repo 'b'
  [255]
  $ hg st

Should arguably print nothing:

  $ hg st b

  $ echo a > a
  $ hg ci -Ama a

Should fail:

  $ hg mv a b
  abort: path 'b/a' is inside repo 'b'
  [255]
  $ hg st