$http_response_header: Improve example #2854
Merged
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adding a bit of comment, as one could easily miss the
NULL
beeing printed after the big block of headers in https://github.com/php/doc-en/pull/2854/files#diff-138db1f807d6240d97d7f6124fecf1b519567a6add6b6d85fc5e7862b8fb418eL62