[issue14503] docs:Code not highlighted

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

> they are highlighted
No. Keywords normally appear in bold font, and with another color. This is not the case in these blocks.

Probably because the language detection does not work with the new "yield from" construct.  Sphinx should always use the latest Python...

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nosy: +amaury.forgeotdarc

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