#2560 Rename variable to better describe what it's doing.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22051 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2540 Fixed Typo

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@22053 b5f69653-2bf5-0310-8201-b0dafb8e1405