fix(docs): typos in using-react-context-api-with-gatsby

[catherineleung]

No description provided.

[wardpeet]

Thansk for updating these typos! ❤️

[gatsbot]

Holy buckets, @catherineleung — we just merged your PR to Gatsby! 💪💜

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Thanks again!

[catherineleung]

Thansk for updating these typos! ❤️

Very happy to help! ❤️Starting off small and I hope to contribute more! Lovin' gatsby so far :)