Prettify docs-update.py

Remove commented code, use format for string concatenation, split long lines, fix how-to-run instructions
Signed-off-by: Davide Ceretti <dav.ceretti@gmail.com>
Edits and fixes to Dockerfile Best Practices based on review feedback.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Add ENV variables support to WORKDIR build command

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Docker-DCO-1.1-Signed-off-by: Adrien Folie <folie.adrien@gmail.com> (github: folieadrien)

Conflicts:
	builder/builder.go
		This file has been deleted.
Edits and fixes to Dockerfile Best Practices based on review feedback.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
add test and move one from rm to rmi

Signed-off-by: Victor Vieux <vieux@docker.com>
Add note to docs about lack of shell processing in JSON form

Closes #5509

Signed-off-by: Doug Davis <dug@us.ibm.com>
Fixed a typo in "Installing Docker on Mac OS X"

evironment -> environment
Multiple fixes to the cli.md document.

*. Fixed headings so the side menu will now be consistent. Some sections
had H3s that were displaying and others did not leaving the left menu
very mismatched.

* Fixed several spelling errors.

* Re-formatted several long lines and badly laid out paragraphs.

* Fixed several double backticks.

* Added backticks to several outputs and variables.

* Removed two issues that are no longer valid.

* Removed several double spaces and extra lines.

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Fixes bad validMountMode check

Needed to check if the mode was invalid and return error, not valid and
return error.

This didn't get picked up because the existing integration-cli tests
were all either expecting errors when a valid mode was passed in (e.g.
"ro" passed in, we expected an error because it was testing write).  So
modified a test which was testing for "rw" to actually pass in "rw"
instead of assuming the "rw"

Docker-DCO-1.1-Signed-off-by: Brian Goff <bgoff@cpuguy83-mbp.home> (github: cpuguy83)
Remove registry v2 code path

As this feature requires more testing it is much safter to get the
underlying changes into the codebase first then enable the feature in
another release after proper testing and verification can be done.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Add test for invalid mount mode for volumes in.
Closes #8389.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Merge pull request #8392 from jfrazelle/pr_8389

Invalid mount mode for volumes in
Merge pull request #8222 from fredlf/adding_official-repo-guidelines

Edits and fixes based on review.
Merge pull request #8360 from duglin/Issue5509

Add note to docs about lack of shell processing in JSON form - Issue 5509
Merge pull request #8388 from merty/patch-1

Fixed a typo in "Installing Docker on Mac OS X"
Fix builder/parser so it keeps some whitespace on split lines.
If previous line ends with whitespace, or next line starts with whitepsace
we need to preserve a space otherwise things line:
RUN echo\
   hello
will appear as: RUN echohello

Noticed this while looking at #5744 because he had lines ending in &&\

Signed-off-by: Doug Davis <dug@us.ibm.com>
Make fixed font sizes smaller per Issue #5278

Closes #5278

Signed-off-by: Doug Davis <dug@us.ibm.com>
Fix Host header on stream commands

Fixes #8407

Setting Host on URL only works if the Request does not
already have its Host property set.

Note that the API version was also swallowed.

Signed-off-by: Tõnis Tiigi <tonistiigi@gmail.com> (github: tonistiigi)
Fix streaming JSON Content-type for postBuild

See #8101

lineDelim is used by streamJSON() so it needs to be set
before its called.

Signed-off-by: Tõnis Tiigi <tonistiigi@gmail.com> (github: tonistiigi)
Merge pull request #8413 from tonistiigi/build-content-type

Fix streaming JSON Content-type for postBuild