Fixing sphinx violations and errors
Fixes #18114
Removing non existing document
Including doc in toctree
add systemd info in grains
fix pylint
vbox_guest module: not upgrade OS by default (can be unexpected)
Merge pull request #18197 from nmadhok/doc-fixes

Fixing sphinx violations and errors
Merge pull request #18200 from ianare/systemd_grains

add systemd info in grains
Merge pull request #18202 from rominf/virtualbox

vbox_guest module: not upgrade OS by default (can be unexpected)
Merge pull request #18208 from SmithSamuelM/sam_call2

Fix some bugs. Better support for new async salt-run. preliminary support for syndic
Add syndic application kind to channel and event stack lane naming code