Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index da871ee..69b1804 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -362,7 +362,7 @@
 	 * we do not require it to remember exactly which old buffers it
 	 * has reserved.  This is consistent with the existing behaviour
 	 * that multiple journal_get_write_access() calls to the same
-	 * buffer are perfectly permissable.
+	 * buffer are perfectly permissible.
 	 */
 	while (commit_transaction->t_reserved_list) {
 		jh = commit_transaction->t_reserved_list;