Updating broken links on the Documentors Quick Reference page

[usmanpm]

Updated two links on the Documentors Quick Reference page; one was broken, and the other redirected to a page requiring a login. Replaced them with direct appropriate links to the Sphinx documentation.

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[mphilbrick211]

Hi @usmanpm! Just confirming your CLA is all set, so when the tests run again, the check should turn green.