GitHub does not render reStructuredText admonitions (notes, etc.) at all well

[rptb1]

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GitHub does a pretty good job of displaying reStructuredText documents, but it fails to render "admonitions", such as notes. For example, https://github.com/Ravenbrook/mps/blob/363eebf61b4d522f72143e38140afb65b6c6b3a2/design/collection.txt#L47-L54

_`.framework.mpm`: The Collection Framework is merely a part of the
structure of the MPM. See design.mps.architecture and design.mps.arch
for the big picture.

.. note::

    Those two documents should be combined into one. Pekka P. Pirinen,
    1998-01-15.

is rendered as

(and the HTML doesn't have the necessary markup either).

Admonitions don't need to be fancy, but they do need to stand out from the body text.

Thanks!

[flying-sheep]

See github/markup#1682