Added a note.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/nil_trunk@5974 35acf78f-673a-0410-8e92-d51de3d6d3f4
Typo...

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/nil_trunk@5975 35acf78f-673a-0410-8e92-d51de3d6d3f4