typo fix: 'methid' -> 'method'
Docs/CSS: Amend code block rendering.

This commit aims to improve the rendering of code blocks by
reducing the padding, matching the font-size with the rest of the
documentation text and finally, by changing the background colour
back to white from its current gray-ish state which matches the
background colour and making it really hard to spot the code.

Note: The BG colouring issue is due to converting the main BG
to gray whilst missing to change parts that where gray to white, i.e.,
not making the complete switch.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Update some whitespace in hack/make/test-integration-cli for consistency

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Use "docker load" to create "scratch" in hack/make/test-integration-cli (instead of implicitly pulling it from the index)

Creating the "docker save" tarball for "scratch" is pretty simple.  I've also extrapolated the "docker build -t busybox ." logic into a separate "hack/make/.ensure-busybox" file so that it can eventually be reused easier.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
docs: DisableNetwork -> NetworkDisabled

Docker-DCO-1.1-Signed-off-by: Samuel Reis <srijs@airpost.net> (github: srijs)
Merge pull request #5475 from srijs/patch-1

docs: DisableNetwork -> NetworkDisabled
Update working-with-docker.md
Add a TESTDIRS variable to the test bundle to allow for the running of a
single go directory worth of tests.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
Merge pull request #5478 from amangoel/patch-1

Update working-with-docker.md
Merge pull request #5460 from tianon/no-pull-scratch

Use "docker load" to create "scratch" in hack/make/test-integration-cli (instead of implicitly pulling it from the index)
Merge pull request #5440 from ostezer/docs-improve-code-block-rendering

Docs/CSS: Amend code block rendering.
Merge pull request #5477 from vmarmol/add-testdirs

Add a TESTDIRS variable to the test bundle to control which directories are unit tested
Close extraneous file descriptors in containers

Without this patch, containers inherit the open file descriptors of the daemon, so my "exec 42>&2" allows us to "echo >&42 some nasty error with some bad advice" directly into the daemon log. :)

Also, "hack/dind" was already doing this due to issues caused by the inheritance, so I'm removing that hack too since this patch obsoletes it by generalizing it for all containers.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Add new test-unit make rule which only runs the unit tests. Renames test
bundle to test-unit.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
for want of a comma, the kingdom was lost

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5320 from JackDanger/jackdanger/typo-doc-fix
Merge pull request #5487 from SvenDowideit/docs-fix-invalid-json

for want of a comma, the kingdom was lost
Merge pull request #5484 from vmarmol/add-test-unit

Add new test-unit make rule which only runs the unit tests
for want of a comma, the kingdom was lost

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Add new test-unit make rule which only runs the unit tests. Renames test
bundle to test-unit.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)