docs: fix typos and grammar

Fix several spelling mistakes, subject-verb agreement issues, and
duplicated words.

Signed-off-by: Weijie Yuan <wy@wyuan.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: bertyuan

Documentation/fetch-options.adoc

@@ -1,6 +1,6 @@
 `--all`::
 `--no-all`::
-	Fetch all remotes, except for the ones that has the
+	Fetch all remotes, except for the ones that have the
 	`remote.<name>.skipFetchAll` configuration variable set.
 	This overrides the configuration variable `fetch.all`.
 

combine-diff.c

@@ -666,7 +666,7 @@ static int make_hunks(struct sline *sline, unsigned long cnt,
 		 *   (-) line, which records from what parents the line
 		 *       was removed; this line does not appear in the result.
 		 * then check the set of parents the result has difference
-		 * from, from all lines.  If there are lines that has
+		 * from, from all lines.  If there are lines that have
 		 * different set of parents that the result has differences
 		 * from, that means we have more than two versions.
 		 *

contrib/subtree/t/t7900-subtree.sh

@@ -75,7 +75,7 @@ test_create_pre2_32_repo () {
 #
 # Create a simple subtree on a new branch named ORPHAN in REPO.
 # The subtree is then merged into the current branch of REPO,
-# under PREFIX. The generated subtree has has one commit
+# under PREFIX. The generated subtree has one commit
 # with subject and tag FILENAME with a single file "FILENAME.t"
 #
 # When this method returns:

csum-file.h

@@ -52,7 +52,7 @@ struct hashfd_options {
 	 */
 	struct progress *progress;
 
-	/* The length of the buffer that shall be used read read data. */
+	/* The length of the buffer that shall be used to read data. */
 	size_t buffer_len;
 };
 

delta-islands.c

@@ -527,7 +527,7 @@ void free_island_marks(void)
 		kh_destroy_oid_map(island_marks);
 	}
 
-	/* detect use-after-free with a an address which is never valid: */
+	/* detect use-after-free with an address which is never valid: */
 	island_marks = (void *)-1;
 }
 

diffcore-pickaxe.c

@@ -203,7 +203,7 @@ static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
 		for (i = 0; i < q->nr; i++)
 			diff_free_filepair(q->queue[i]);
 	} else {
-		/* Showing only the filepairs that has the needle */
+		/* Showing only the filepairs that have the needle */
 		for (i = 0; i < q->nr; i++) {
 			struct diff_filepair *p = q->queue[i];
 			if (pickaxe_match(p, o, regexp, kws, fn))

odb.h

@@ -57,7 +57,7 @@ struct object_database {
 	struct repository *repo;
 
 	/*
-	 * State of current current object database transaction. Only one
+	 * State of current object database transaction. Only one
 	 * transaction may be pending at a time. Is NULL when no transaction is
 	 * configured.
 	 */

parse-options.c

@@ -1149,7 +1149,7 @@ enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
 		    (ctx->flags & PARSE_OPT_KEEP_UNKNOWN_OPT)) {
 			/*
 			 * Found an unknown option given to a command with
-			 * subcommands that has a default operation mode:
+			 * subcommands that have a default operation mode:
 			 * we treat this option and all remaining args as
 			 * arguments meant to that default operation mode.
 			 * So we are done parsing.

rerere.c

@@ -548,7 +548,7 @@ static int check_one_conflict(struct index_state *istate, int i, int *type)
 
 /*
  * Scan the index and find paths that have conflicts that rerere can
- * handle, i.e. the ones that has both stages #2 and #3.
+ * handle, i.e. the ones that have both stages #2 and #3.
  *
  * NEEDSWORK: we do not record or replay a previous "resolve by
  * deletion" for a delete-modify conflict, as that is inherently risky

t/t4203-mailmap.sh

@@ -180,7 +180,7 @@ test_expect_success 'mailmap.file set' '
 	git shortlog HEAD >actual &&
 	test_cmp expect actual &&
 
-	# The internal_mailmap/.mailmap file is an a subdirectory, but
+	# The internal_mailmap/.mailmap file is in a subdirectory, but
 	# as shown here it can also be outside the repository
 	test_when_finished "rm -rf sub-repo" &&
 	git clone . sub-repo &&