Run codespell -w against all files

and fix the wrong correction

fs/mqueue/mq_unlink.c

@@ -131,8 +131,8 @@ int mq_unlink(FAR const char *mq_name)
   ret = inode_remove(fullpath);
 
   /* inode_remove() should always fail with -EBUSY because we hae a reference
-   * on the inode.  -EBUSY means taht the inode was, indeed, unlinked but
-   * thatis could not be freed because there are refrences.
+   * on the inode.  -EBUSY means that the inode was, indeed, unlinked but
+   * thatis could not be freed because there are references.
    */
 
   DEBUGASSERT(ret >= 0 || ret == -EBUSY);