Fix mention of common/conf.py

since it has moved

src/sage/misc/latex_macros.py

@@ -14,7 +14,7 @@
 the ``_latex_`` method for each Sage object listed in ``macros``, and
 the MathJax macros are produced from the LaTeX macros.  The list of
 LaTeX macros is used in the file
-``SAGE_DOC_SRC/common/conf.py`` to add to the preambles of
+``sage.docs.conf`` to add to the preambles of
 both the LaTeX file used to build the PDF version of the documentation
 and the LaTeX file used to build the HTML version.  The list of
 MathJax macros is used in the file

src/sage/misc/sagedoc.py

@@ -491,7 +491,7 @@ def process_extlinks(s, embedded=False):
     Sphinx extlinks extension. For example, replace ``:trac:`NUM```
     with ``https://trac.sagemath.org/NUM``, and similarly with
     ``:python:TEXT`` and ``:wikipedia:TEXT``, looking up the url from
-    the dictionary ``extlinks`` in SAGE_DOC_SRC/common/conf.py.
+    the dictionary ``extlinks`` in ``sage.docs.conf``.
     If ``TEXT`` is of the form ``blah <LINK>``, then it uses ``LINK``
     rather than ``TEXT`` to construct the url.