fetch: change "branch" to "reference" in --force -h output

The -h output has been referring to the --force command as forcing the
overwriting of local branches, but since "fetch" more generally
fetches all sorts of references in all refs/ namespaces, let's talk
about forcing the update of a a "reference" instead.

This wording was initially introduced in 8320199873 ("Rewrite
builtin-fetch option parsing to use parse_options().", 2007-12-04).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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