Remove javadoc @code and other oldfashioned styles

This makes little sense and today we want more basic javadoc as it works better for tooling such as in vscode etc.

eg notice the @code in the tooltip


The issue identifies Javadoc styling and an example tooltip, but names no files or tests. Start by locating the affected Javadocs in the repository and checking how their rendered tooltips appear in the referenced tooling; done means the outdated styles are removed and the basic documentation renders as intended.

Written by the indexing model from the issue text.