fix wrong outdated ref, and makefile target

Makefile

@@ -60,4 +60,4 @@ test:
 
 # make a source distribution, used for building the spkg
 dist: sagetex.sty $(pypkg) $(pyscripts) $(pkg).pdf example.pdf
-	python setup.py sdist --formats=gztar
+	sage --python setup.py sdist --formats=gztar

py-and-sty.dtx

@@ -1521,9 +1521,9 @@ SAGE_ROOT/venv/share/doc/sagetex.""")
 % \begin{center}
 % \verb+egrep -v '^( _st_.goboom| ?_st_.current_tex_line|print(.SageT)' filename.sage | md5sum+
 % \end{center}
-% in a shell. The included |run-sagetex-if-necessary| uses this
+% in a shell. The included |sagetex-run| uses this
 % mechanism to, well, only run Sage when necessary; see
-% \autoref{sec:run-sagetex-if-necessary}.
+% \autoref{sec:sagetex-run}.
 %    \begin{macrocode}
   def endofdoc(self):
     sagef = open(self.filename + '.sagetex.sage', 'r')

sagetex.dtx

@@ -960,8 +960,8 @@ suggestions.
 % the typesetting engine dropdown menu and then typeset.
 %
 % (You can also replace "|sage|" above with the
-% |run-sagetex-if-necessary| script---see
-% \autoref{sec:run-sagetex-if-necessary}.)
+% |sagetex-run| script---see
+% \autoref{sec:sagetex-run}.)
 %
 % \subsection{Using Beamer}
 %