CONTRIBUTING.md: correct how to sign the CLA by javeme · Pull Request #1819

CONTRIBUTING.md: correct how to sign the CLA by javeme · Pull Request #1819 · apache/hugegraph


		`I have read the CLA Document and I hereby sign the CLA`

		Note that please make sure the email address you submit the code is bound to the GitHub account. For how to bind the email address, please refer to https://github.com/settings/emails:

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typo and simplify:

Note: please make sure the code you submit has bounded with the email address in your GitHub account.

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Here, most users use emails bound to the github, but some users have already submitted the code with different email and pushed it to github, then trigger this problem, so here is a note that more emails can be bound to github.