comment: fix spelling mistakes inside comments

This commit fixes a couple of minor spelling mistakes inside
comments.

Signed-off-by: Steve Kemp <steve@steve.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

add-patch.c

@@ -1203,7 +1203,7 @@ static int edit_hunk_loop(struct add_p_state *s,
 	for (;;) {
 		int res = edit_hunk_manually(s, hunk);
 		if (res == 0) {
-			/* abandonded */
+			/* abandoned */
 			*hunk = backup;
 			return -1;
 		}

column.c

@@ -107,7 +107,7 @@ static void display_plain(const struct string_list *list,
 		printf("%s%s%s", indent, list->items[i].string, nl);
 }
 
-/* Print a cell to stdout with all necessary leading/traling space */
+/* Print a cell to stdout with all necessary leading/trailing space */
 static int display_cell(struct column_data *data, int initial_width,
 			const char *empty_cell, int x, int y)
 {

grep.c

@@ -1817,7 +1817,7 @@ static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int colle
 		 * We might set up the shared textconv cache data here, which
 		 * is not thread-safe. Also, get_oid_with_context() and
 		 * parse_object() might be internally called. As they are not
-		 * currenty thread-safe and might be racy with object reading,
+		 * currently thread-safe and might be racy with object reading,
 		 * obj_read_lock() must be called.
 		 */
 		grep_attr_lock();

ref-filter.c

@@ -1980,7 +1980,7 @@ static int for_each_fullref_in_pattern(struct ref_filter *filter,
  * of oids. If the given ref is a tag, check if the given tag points
  * at one of the oids in the given oid array.
  * NEEDSWORK:
- * 1. Only a single level of inderection is obtained, we might want to
+ * 1. Only a single level of indirection is obtained, we might want to
  * change this to account for multiple levels (e.g. annotated tags
  * pointing to annotated tags pointing to a commit.)
  * 2. As the refs are cached we might know what refname peels to without