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spec: Mention the well-known fallback path for the session bus

Hugo requested to merge WhyNotHugo/dbus:fallback-path into master

Multiple implementations (including dbus itself and zbus use the path $XDG_RUNTIME_DIR/bus when $DBUS_SESSION_BUS_ADDRESS is unset.

This fallback path is quite convenient, but not documented as part of the specification. This changeset adds a mention of this de-fact standard fallback.

Fixes: #449

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