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

[Zachary Ware]

Change by Zachary Ware <zachary.ware at gmail.com>:


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pull_requests: +15398
pull_request: https://github.com/python/cpython/pull/15744

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15817>
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