Nits [ci skip]

- Mac OS X is now called just OS X
- Capitalize headers

docs/installation.rst

@@ -12,7 +12,7 @@ Installation
 
 .. note:: Pillow < 2.0.0 supports Python versions 2.4, 2.5, 2.6, 2.7.
 
-Simple installation
+Simple Installation
 -------------------
 
 .. note::
@@ -121,7 +121,7 @@ Sample Usage::
     $ MAX_CONCURRENCY=1 python setup.py build-ext --enable-[feature] install
 
 
-Linux installation
+Linux Installation
 ------------------
 
 .. note::
@@ -160,8 +160,8 @@ Prerequisites are installed on **Fedora 20** with::
         lcms2-devel libwebp-devel tcl-devel tk-devel
 
 
-Mac OS X installation
----------------------
+OS X Installation
+-----------------
 
 We provide binaries for OS X in the form of `Python Wheels <http://wheel.readthedocs.org/en/latest/index.html>`_. Alternatively you can compile Pillow with with XCode.
 
@@ -173,7 +173,7 @@ Install Pillow with::
 
     $ pip install Pillow
 
-Windows installation
+Windows Installation
 --------------------
 
 We provide binaries for Windows in the form of Python Eggs and `Python Wheels
@@ -208,8 +208,8 @@ to a specific version:
 
     $ pip install --use-wheel Pillow==2.6.1
 
-FreeBSD installation
----------------------
+FreeBSD Installation
+--------------------
 
 .. Note:: Only FreeBSD 10 tested