Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 97b970e..1c67139 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -547,7 +547,7 @@
  *
  * ext4_should_retry_alloc() is called when ENOSPC is returned, and if
  * it is profitable to retry the operation, this function will wait
- * for the current or commiting transaction to complete, and then
+ * for the current or committing transaction to complete, and then
  * return TRUE.
  *
  * if the total number of retries exceed three times, return FALSE.