update installation instructions

content/install.rst

@@ -140,7 +140,7 @@ The fingerprint of the key is 5229 9057 FAD7 9965 3C4F 088A C3F1 47F5 980F
 
 Mac OS X
 ========
-Pre-built packages for Max OS X exist for the ``conda`` package
+`Pre-built packages <#conda>` for Max OS X exist for the ``conda`` package
 manager, which is a part of the `Anaconda` Python distribution.
 Using ``conda`` is the recommended way to install Kwant on Mac OS X.