Armin Rigo  committed 80706f8

Documentation tweak

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File doc/source/index.rst

 * libffi (you need ``libffi-dev``); the Windows version is included with CFFI.
+* a C compiler is required to use CFFI during development, but not to run
+  correctly-installed programs that use CFFI.
 Download and Installation:
 * or you can directly import and use ``cffi``, but if you don't
   compile the ``_cffi_backend`` extension module, it will fall back
-  to using internally ``ctypes`` (slower and does not support
-  ``verify()``).
+  to using internally ``ctypes`` (much slower and does not support
+  ``verify()``; we recommend not to use it).