improve output by trimming spaces from <pre> and <highlight> output.
- strip the initial empty lines, but keep initial indentation
- strip trailing whitespace completely.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1564956 13f79535-47bb-0310-9956-ffa450edef68
this is not a quote.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1564957 13f79535-47bb-0310-9956-ffa450edef68