(#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
Merge branch '1.1.x' into 1.2.x

* 1.1.x:
  (#22380) Document store-usage and temp-usage

Conflicts:
	documentation/configure.markdown