(maint) document max-threads

This documents the Jetty setting for 'max-threads'.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #608 from kbarber/maint/1.1.x/document-max-threads

(maint) document max-threads
(22247) Remove docs task and references

The building of docs has been moved out of this project and into
docs.puppetlabs.com
Merge branch 'remove_docs_task' into 1.1.x

* remove_docs_task:
  (22247) Remove docs task and references
(#22380) Document store-usage and temp-usage

Though the default config.ini specifies the purpose of these options,
they are not in the official documentation.
(cherry picked from commit 3245614dbf132010f21aeecd5b2e33c3cb3caead)

Conflicts:
	documentation/configure.markdown