Better M-dash (Jonas)

src/quickstart/cythonize.rst

@@ -71,7 +71,7 @@ This results in a 4 times speedup over the pure Python version.
 Typing Functions
 ----------------
 
-Python function calls can be expensive--in Cython doubly so because
+Python function calls can be expensive -- in Cython doubly so because
 one might need to convert to and from Python objects to do the call.
 In our example above, the argument is assumed to be a C double both inside f()
 and in the call to it, yet a Python ``float`` object must be constructed around the

src/tutorial/pxd_files.rst

@@ -2,7 +2,7 @@ pxd files
 =========
 
 In addition to the ``.pyx`` source files, Cython uses ``.pxd`` files
-which work like C header files--they contain Cython declarations
+which work like C header files -- they contain Cython declarations
 (and sometimes code sections) which are only meant for inclusion by
 Cython modules.  A ``pxd`` file is imported into a ``pyx`` module by
 using the ``cimport`` keyword.