* Remove markdown from DocBlock summaries as it's not supported.
* Add backticks around inline code elements in long descriptions and tag descriptions.
* Add markdown where relevant in long descriptions and tag descriptions to improve readability of the rendered output.
* Add inline `{@see ...}` tags to create links to other documented elements.
* Add inline `{@link ...}` tags.
* Replace `<code>` tags with code block syntax.
* Lower the amount of indentation used in code blocks for more readable rendering.
* Replace singular backticks for multi-line code blocks with triple backticks, to allow for rendering as a proper code block instead of inline.
* Replace some semi-lists with list syntax supported via markdown for better rendering.
* Replace some list like return value array definitions with code blocks for better rendering.
* Make some "Note:"  remarks use blockquote syntax to draw more attention to them.
* Use uppercase true/false/null in `@return` tags to make them more easily readable at a glance.