Fix typos in the user guide main page

Signed-off-by: Joel Friedly <joelfriedly@gmail.com>
Updated installation docs for CRUX as a Docker Host.

Docker-DCO-1.1-Signed-off-by: James Mills <prologic@shortcircuit.net.au> (github: therealprologic)
Closes #9296 adds a more detailed note about the mount behavior with -v flag

Signed-off-by: Andrew C. Bodine <acbodine@us.ibm.com>
Update format of notes in docs style guide

It seems like all of the notes in the docs are this format.

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Fix a small typo

Signed-off-by: Michael Steinert <mike.steinert@gmail.com>
Merge pull request #9275 from jfriedly/userguide-typos

Fix typos in the user guide main page
Explain what the VIRTUAL SIZE means

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #9282 from SvenDowideit/explain-VIRTUAL-SIZE

Explain what the VIRTUAL SIZE means
Merge pull request #9368 from msteinert/builder-md-typo

Fix a small typo
Merge pull request #9359 from bfirsh/update-note-format-in-docs-style-guide

Update format of notes in docs style guide
Merge pull request #9329 from acbodine/9296-dockervolume-doc-mount-behaviour-fix

Closes #9296 adds a more detailed note about the mount behavior with -v ...
Merge pull request #9285 from therealprologic/update-crux-docs

Updated installation docs for CRUX as a Docker Host.