doc: config: replace backtick with apostrophe for possessive

Revert back to “Git's” which was used before d30c5cc (doc: convert
git-mergetool options to new synopsis style, 2025-05-25) accidentally
changed it.

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: LemmingAvalanche

Documentation/config/mergetool.adoc

@@ -65,7 +65,7 @@ endif::[]
 	During a merge, Git will automatically resolve as many conflicts as
 	possible and write the `$MERGED` file containing conflict markers around
 	any conflicts that it cannot resolve; `$LOCAL` and `$REMOTE` normally
-	are the versions of the file from before Git`s conflict
+	are the versions of the file from before Git's conflict
 	resolution. This flag causes `$LOCAL` and `$REMOTE` to be overwritten so
 	that only the unresolved conflicts are presented to the merge tool. Can
 	be configured per-tool via the `mergetool.<tool>.hideResolved`