tests/test-check-format.t

sslutil: fix comment to use inclusive or instead of exclusive or

The incorrect "either" was introduced by one of my recent patches.

#require black

  $ cd $RUNTESTDIR/..
  $ black --config=black.toml --check --diff `hg files 'set:(**.py + grep("^#!.*python")) - mercurial/thirdparty/**'`