Merge pull request #14177 from terminalmage/docs

Docs cleanup
Update 'doc/.tx/config' - Build #112

  http://cookingwithsalt.org/job/salt/job/transifex/112/

Signed-off-by: Pedro Algarvio <pedro@algarvio.me>
Document requirements argument
Merge pull request #14182 from s0undt3ch/hotfix/transifex-updates

Update 'doc/.tx/config' - Build #112
Merge pull request #14186 from graingert/patch-1

Document requirements argument
cmd: do not use VT for unless/onlyif
Merge pull request #14191 from makinacorpus/fp

cmd: do not use VT for unless/onlyif
Fix double-colon and remove redundant section

There is a section in part 2 that is already covered in-depth in part 1,
this commit removes it.
Convert double-colon to code-block