global: Fix duplicate word typos

Used regex to find these typos:

    (?<!struct )(?<=\s)([a-z]{1,}) \1(?=\s)

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Signed-off-by: Taylor Blau <me@ttaylorr.com>

fsmonitor.c

@@ -247,7 +247,7 @@ static size_t handle_using_name_hash_icase(
 	 * technically this is a tracked file or a sparse-directory.
 	 * It should not have any entries in the untracked-cache, so
 	 * we should not need to use the case-corrected spelling to
-	 * invalidate the the untracked-cache.  So we may not need to
+	 * invalidate the untracked-cache.  So we may not need to
 	 * do this.  For now, I'm going to be conservative and always
 	 * do it; we can revisit this later.
 	 */