Properly escape "<" and ">" in api-doc documentation.
Since all documentation is rendered via HTML, the characters "<" and ">" have to be HTML-quoted, otherwise strange things (omission, unintended renderings) might occur.
E.g. the sentence
Define an interface between a page and an ADP <include> similar to the page_contract.
was rendered as
Define an interface between a page and an ADP similar to the page_contract.
new proc "ad_log_deprecated": unified interface for logging deprecated usages
The existing code used a larger variety of different messages to denote invocations of deprecated procs and other artifacts. "ad_log_deprecated" provides a unified interface, and provides a usage hint what to use instead based on the API-doc definitions in the log-file.