[PR] Fix typo `,` -> `;` in libdef docs
[PR] Fix typo `,` -> `;` in libdef docs

Summary:
Pretty sure this should be a `;`
Pull Request resolved: https://github.com/facebook/flow/pull/7112

Reviewed By: gabelevi

Differential Revision: D13348532

Pulled By: panagosg7

fbshipit-source-id: 8aede651526b0b56e406e6c53da3a793bee68d01

popham/flow,popham/flow,facebook/flow,samwgoldman/flow,mroch/flow,gabelevi/flow,gabelevi/flow,facebook/flow,AgentME/flow,samwgoldman/flow,popham/flow,facebook/flow,popham/flow,samwgoldman/flow,popham/flow,gabelevi/flow,gabelevi/flow,AgentME/flow,facebook/flow,mroch/flow,popham/flow,AgentME/flow,samwgoldman/flow,mroch/flow,facebook/flow,AgentME/flow,facebook/flow,samwgoldman/flow,gabelevi/flow,samwgoldman/flow,mroch/flow,AgentME/flow,popham/flow,facebook/flow,samwgoldman/flow,gabelevi/flow,mroch/flow,mroch/flow,mroch/flow,gabelevi/flow