doc: fix misrendering due to `single quote'

AsciiDoc misparses some text that contains a `literal`
word followed by a fancy `single quote' word, and treats
everything from the start of the literal to the end of the
quote as a single-quoted phrase.

We can work around this by switching the latter to be a
literal, as well. In the first case, this is perhaps what
was intended anyway, as it makes us consistent with the the
earlier literals in the same paragraph. In the second, the
output is arguably better, as we will format our commit
references as <code> blocks.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/diff-generate-patch.txt

@@ -77,7 +77,7 @@ combined diff format
 Any diff-generating command can take the `-c` or `--cc` option to
 produce a 'combined diff' when showing a merge. This is the default
 format when showing merges with linkgit:git-diff[1] or
-linkgit:git-show[1]. Note also that you can give the `-m' option to any
+linkgit:git-show[1]. Note also that you can give the `-m` option to any
 of these commands to force generation of diffs with individual parents
 of a merge.
 

Documentation/git-rebase.txt

@@ -80,7 +80,7 @@ remain the checked-out branch.
 If the upstream branch already contains a change you have made (e.g.,
 because you mailed a patch which was applied upstream), then that commit
 will be skipped. For example, running `git rebase master` on the
-following history (in which A' and A introduce the same set of changes,
+following history (in which `A'` and `A` introduce the same set of changes,
 but have different committer information):
 
 ------------