Compensate for https://github.com/pypa/wheel/issues/189

src/python/grpcio/README.rst

@@ -16,8 +16,8 @@ Installation
 
 gRPC Python is available for Linux, macOS, and Windows.
 
-From PyPI
+Installing From PyPI
-~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~
 
 If you are installing locally...
 
@@ -45,8 +45,8 @@ n.b. On Windows and on Mac OS X one *must* have a recent release of :code:`pip`
 to retrieve the proper wheel from PyPI. Be sure to upgrade to the latest
 version!
 
-From Source
+Installing From Source
-~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~
 
 Building from source requires that you have the Python headers (usually a
 package named :code:`python-dev`).

tools/distrib/python/grpcio_tools/README.rst

@@ -17,8 +17,8 @@ Installation
 The gRPC Python tools package is available for Linux, Mac OS X, and Windows
 running Python 2.7.
 
-From PyPI
+Installing From PyPI
-~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~
 
 If you are installing locally...
 
@@ -50,8 +50,8 @@ You might also need to install Cython to handle installation via the source
 distribution if gRPC Python's system coverage with wheels does not happen to
 include your system.
 
-From Source
+Installing From Source
-~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~
 
 Building from source requires that you have the Python headers (usually a
 package named :code:`python-dev`) and Cython installed. It further requires a