Update README

Author: binarybottle

README.rst

@@ -88,7 +88,7 @@ terminal window)::
 over 6GB.*
 
 *Note 2: You may need to increase memory allocated by Docker to at least 5GB.
-For example: By default, Docker for `Mac is set to use 2 GB runtime memory <https://docs.docker.com/docker-for-mac/>`_.
+For example: By default, Docker for `Mac is set to use 2 GB runtime memory <https://docs.docker.com/docker-for-mac/>`_.*
 
 3. Optionally download sample data. To try out the ``mindboggle`` examples
 below, download and unzip the directory of example input data