Sets up texinfo documentation.#3

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HugoNikanor wants to merge 3 commits intoartyom-poptsov:masterfrom

HugoNikanor:documentation

Commits on Feb 6, 2022

doc/* Extract docstrings into info pages.
Hugo Hörnquist
committed
Document valid arguments to make-dbus-connection.
Hugo Hörnquist
committed
Additions to dbus-message.texi.
Hugo Hörnquist
committed