docs: vm/page_owner: use literal blocks for param description

docs: vm/page_owner: use literal blocks for param description

Sphinx generates hard-to-read lists of parameters at the bottom of the
page.  Fix them by putting literal-block markers of "::" in front of
them.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Akira Yokosawa <[email protected]>
Fixes: 57f2b54a9379 ("Documentation/vm/page_owner.rst: update the documentation")
Cc: Shenghong Han <[email protected]>
Cc: Haowen Bai <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Alex Shi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>