Change 12221

Adding usage example text.

Example Usage:
 CheckCaseTrigger change-submit //... "python %changelist%"

Sample output:

Submit validation failed -- fix problems then use 'p4 submit -c 1234'.
 'CheckCaseTrigger' validation failed:

Your submission has been rejected because the following files
are inconsistent in their use of case with respect to existing

Your file:         '//depot/dir/test'
existing file/dir: '//depot/DIR'
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