ext4: fix spelling errors in comments

'functoin' and 'entres' should be 'function' and 'entries' respectively

Signed-off-by: Chin Yik Ming <yikming2222@gmail.com>
Link: https://lore.kernel.org/r/20220402090744.8918-1-yikming2222@gmail.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>