Minor edits prior to tagging V8.1.0.

git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@2291 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
Lower the minimum stack size used by the ATSAMA5 demo.

git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@2292 1d2547de-c912-0410-9cb9-b8ca96c0e9e2