Add comment in _checkSignaturesLength regarding dynamic signatures

[akshay-ap]

This PR adds a comment on dynamic signatures and signature length manipulation in _checkSignaturesLength Natspec

[coveralls]

Pull Request Test Coverage Report for Build 10561094866

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 10008091065:	0.0%
Covered Lines:	51
Relevant Lines:	51

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💛 - Coveralls