Fix typo in PULL_REQUEST_TEMPLATE.md
Fix typo in PULL_REQUEST_TEMPLATE.md

Summary:
Found a typo.

N/A

 [INTERNAL] [MINOR] [GitHub] -Fix typo in PULL_REQUEST_TEMPLATE.md
Closes https://github.com/facebook/react-native/pull/16723

Differential Revision: D6260883

Pulled By: hramos

fbshipit-source-id: 7feb8ba60f5c63849ef89ef8385c7ddf52ed65e3

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