Unused variable and wrong propTypes

[soobing]

Description

Documentation

seo and social sharing cards tutorial

Related Issues

closes #22425

[soobing]

Fail from ci/circleci: lint — Your tests failed on CircleCI is not from this issue. Build on master is failing because of a lint conflict. Please check.

[pieh]

Yup, makes sense, thanks!

[gatsbot]

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