[issue15817] Misc/gdbinit: Expose command documentation to gdb help

[Skip Montanaro]

Skip Montanaro <skip.montanaro at gmail.com> added the comment:

This looks good to me. I added a pull request with a couple minor tweaks. Unfortunately, I can't tell how to add a "skip news" label. This doesn't seem "big" enough to warrant it.

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nosy: +skip.montanaro

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<https://bugs.python.org/issue15817>
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