[issue28546] [doc] Clarify setting pdb breakpoints

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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nosy: +miss-islington
nosy_count: 5.0 -> 6.0
pull_requests: +28667
pull_request: https://github.com/python/cpython/pull/30464

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28546>
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