Hi Anitha,
To remember, comments and refinements are for the betterment. My observations:
Offer letter is called as first relation letter with the candidate (Third party not belongs to company) from the company, where as it leaves first impression on the company.
So it must framed and formatted well.
All HR docs must be noted with the clauses . (Points 1, 1.1, 1.22 and on).
If you are missing with the clause, you can't address the point when required.
Regards,
Shiv