clarify on legacy "global" statements
fix building errors
Merge branch 'v5-stable-fix4' of https://github.com/UGerhards/rsyslog-doc into v5-stable

Conflicts:
	source/configuration/property_replacer.rst
fix import errors
fix broken link

...leftover from a previous change (stunnel moved to historical section)
Merge branch 'v5-stable' into v7-stable

Conflicts:
	source/configuration/global/options/rsconf1_rulesetcreatemainqueue.rst
	source/configuration/modules/imtcp.rst
	source/configuration/modules/imuxsock.rst
	source/configuration/modules/mmsnmptrapd.rst
	source/installation/install_from_source.rst