Updating Mac OSX guidance comment to make it a note for issue #12454.

docsite/rst/intro_installation.rst

@@ -135,6 +135,8 @@ Ansible also uses the following Python modules that need to be installed::
 
     $ sudo pip install paramiko PyYAML Jinja2 httplib2 six
 
+.. note::
+
 If you have issues with the "pycrypto" package install on Mac OSX, which is included as a dependency for paramiko, then you may need to try "CC=clang sudo -E pip install pycrypto".
 
 Note when updating ansible, be sure to not only update the source tree, but also the "submodules" in git
@@ -312,6 +314,8 @@ If you are installing on OS X Mavericks, you may encounter some noise from your
 
    $ sudo CFLAGS=-Qunused-arguments CPPFLAGS=-Qunused-arguments pip install ansible
 
+.. note::
+
 If you have issues with the "pycrypto" package install on Mac OSX, which is included as a dependency for paramiko, then you may need to try "CC=clang sudo -E pip install pycrypto".
 
 Readers that use virtualenv can also install Ansible under virtualenv, though we'd recommend to not worry about it and just install Ansible globally.  Do not use easy_install to install ansible directly.