Update WS documentation to use the Action.async builder.
Merge pull request #1730 from sluukkonen/patch-2

Update WS documentation to use the Action.async builder.
Added copyright statements to every file
Merge pull request #1733 from jroper/copyright

Added copyright statements to every file
Fixed MIMA

Just applying the fixes that I did on the 2.2.x branch to master, so
when we fork 2.3.x, it will be easy to enable MIMA.
Merge remote-tracking branch 'upstream/master' into doc-scalafunctionaltest-withbrowser

Conflicts:
	documentation/manual/scalaGuide/main/tests/code/FunctionalTemplateSpec.scala