doc txt & -h consistency: word-wrap

Change the documentation and -h output for those built-in commands
where both the -h output and *.txt were lacking in word-wrapping.

There are many more built-ins that could use this treatment, this
change is narrowed to those where this whitespace change is needed to
make the -h and *.txt consistent in the end.

In the case of "Documentation/git-hash-object.txt" and
"builtin/hash-object.c" this is not a "doc txt & -h consistency"
change, as we're changing both versions, doing so here makes a
subsequent change smaller.

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

builtin/show-branch.c

@@ -14,7 +14,8 @@ static const char* show_branch_usage[] = {
     N_("git show-branch [-a | --all] [-r | --remotes] [--topo-order | --date-order]\n"
        "                [--current] [--color[=<when>] | --no-color] [--sparse]\n"
        "                [--more=<n> | --list | --independent | --merge-base]\n"
-       "                [--no-name | --sha1-name] [--topics] [(<rev> | <glob>)...]"),
+       "                [--no-name | --sha1-name] [--topics]\n"
+       "                [(<rev> | <glob>)...]"),
     N_("git show-branch (-g | --reflog)[=<n>[,<base>]] [--list] [<ref>]"),
     NULL
 };