docs: Fix an erroneous reference to sphinx.rst

Just give the name of the file and let the automarkup stuff do its thing.

Signed-off-by: Jonathan Corbet <[email protected]>

Documentation/process/changes.rst

@@ -391,7 +391,7 @@ Kernel documentation
 Sphinx
 ------
 
-Please see :ref:`sphinx_install` in :ref:`Documentation/doc-guide/sphinx.rst <sphinxdoc>`
+Please see :ref:`sphinx_install` in Documentation/doc-guide/sphinx.rst
 for details about Sphinx requirements.
 
 rustdoc

Documentation/translations/pt_BR/process/howto.rst

@@ -1,6 +1,6 @@
 .. SPDX-License-Identifier: GPL-2.0
 
-.. pt_process_howto:
+.. _pt_process_howto:
 
 COMO FAZER o desenvolvimento do kernel Linux
 ============================================