[PR #8859/e4472b32 backport][stable-9] pipx/pipx_info: refactor doc fragment

[patchback[bot]]

This is a backport of PR #8859 as merged into main (e4472b322bdd1e23f3f876110692a2128e0a9db8).

SUMMARY

Refactor common documentation from modules into a doc fragment. Also improved wording for params name and source.

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

pipx pipx_info

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