docs: hugetlbpage.rst: fix some warnings

docs: hugetlbpage.rst: fix some warnings

Some new command line parameters were added at hugetlbpage.rst.
Adjust them in order to properly parse that part of the file,
avoiding those warnings:

    Documentation/admin-guide/mm/hugetlbpage.rst:105: WARNING: Unexpected indentation.
    Documentation/admin-guide/mm/hugetlbpage.rst:108: WARNING: Unexpected indentation.
    Documentation/admin-guide/mm/hugetlbpage.rst:109: WARNING: Block quote ends without a blank line; unexpected unindent.
    Documentation/admin-guide/mm/hugetlbpage.rst:112: WARNING: Block quote ends without a blank line; unexpected unindent.
    Documentation/admin-guide/mm/hugetlbpage.rst:120: WARNING: Unexpected indentation.
    Documentation/admin-guide/mm/hugetlbpage.rst:121: WARNING: Block quote ends without a blank line; unexpected unindent.
    Documentation/admin-guide/mm/hugetlbpage.rst:132: WARNING: Unexpected indentation.
    Documentation/admin-guide/mm/hugetlbpage.rst:135: WARNING: Block quote ends without a blank line; unexpected unindent.

Fixes: cd9fa28b5351 ("hugetlbfs: clean up command line processing")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/86b6796b1a84e18b24314ecd29318951c1479ca2.1592895969.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>