make it clearer that wheels are even better than faster source builds

docs/src/quickstart/install.rst

@@ -42,18 +42,19 @@ directory, and then run::
 If you have Python setuptools set up on your system, you should be
 able to fetch Cython from PyPI and install it using::
 
-  easy_install cython
+  easy_install Cython
 
 or
 
 ::
 
-  pip install cython
+  pip install Cython
 
 For Windows there is also a wheel package available for download.
 
-For one-time builds, e.g. on CI and test servers, it is substantially
-faster to install an uncompiled (slower) version of Cython with
+For one-time builds, e.g. for CI/testing, on platforms that are not covered
+by one of the wheel packages provided on PyPI, it is substantially faster
+than a full source build to install an uncompiled (slower) version of Cython with
 
 ::
 

setup.py

@@ -296,8 +296,9 @@ setup(
     C/C++ libraries, and for fast C modules that speed up the execution of
     Python code.
 
-    Note that for CI and test builds that use Cython for one-time compilation,
-    you can speed up the Cython installation with::
+    Note that for one-time builds, e.g. for CI/testing, on platforms that are not
+    covered by one of the wheel packages provided on PyPI, it is substantially faster
+    than a full source build to install an uncompiled (slower) version of Cython with::
 
         pip install Cython --install-option="--no-cython-compile"