Visitor visa from India for Canada application documents

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Hi,

I am applying for the visitor visa for Canada for the first time.
I got to that I need to give my employment certificate and leave approval letter from my current employer.
My current employer gives company letter headed letter with logo address and contact information but at the bottom it says that "It is computer generated letter, company seal is not needed".

For visa application, does these letter needs to be company sealed?

Thanks.