better grouping in generated code


the generated docs are a little difficult to read at the moment as we have multiple `impl` blocks that split up these methods into a strange order. it'd be nice if these were all in one section, and ordered in a logical manner. ideally we can be a bit clever about this and not just combine the codegen into one massive function for each `impl` block.

Start by examining the generated documentation and the code-generation entry points that produce its multiple impl blocks. Determine the intended logical grouping and ordering from the current output and issue description. Done means related methods appear together in a readable order without combining all code generation into one massive function.

Written by the indexing model from the issue text.