sage

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gh-37269: sage_docbuild: add needs sphinx tags Add "needs sphinx" tags to some tests in `src/sage_docbuild` so there is no failure when sphinx is not installed in the system. See: https://github.com/sagemath/sage/issues/37263#issuecomment-1935113975 ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. - [x] I have linked a relevant issue or discussion. URL: https://github.com/sagemath/sage/pull/37269 Reported by: Gonzalo Tornaría Reviewer(s):