Updated cross referencing locations link for doc/start/documenting-ceph.rst
Signed-off-by: James McClune <jmcclune@mcclunetechnologies.net>
.. _ditaa: http://ditaa.sourceforge.net/
.. _Document Title: http://docutils.sourceforge.net/docs/user/rst/quickstart.html#document-title-subtitle
.. _Sections: http://docutils.sourceforge.net/docs/user/rst/quickstart.html#sections
-.. _Cross referencing arbitrary locations: http://sphinx-doc.org/markup/inline.html#ref-role
+.. _Cross referencing arbitrary locations: http://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html#role-ref
.. _The TOC tree: http://sphinx-doc.org/markup/toctree.html
.. _Showing code examples: http://sphinx-doc.org/markup/code.html
.. _paragraph level markup: http://sphinx-doc.org/markup/para.html