Docs: 404 links, `generic.md` headlines, misc

[p1xelHer0]

• Reference - Prelude - Core Expander Syntax: the opening paragraph now links to the reference of the current-expander-context instead of 404ing.

  • fixed comment spacing in the core-expand example.

• Reference - Standard Library - Generics: all the predefined types starting with < failed to render on the site, this has been corrected and they should now render correctly, including the sidebar content of said types.

• Reference - Standard Library - Iterators: now correctly links to the Guide explaining iterators.

• refer to "the guide" on in on the website itself as "Guide" with uppercase G. This seemed to be a pattern in other parts of the docs.

• Reference - Standard Library - Syntax Parameters: link to the std/actor-v18/message.ss instead of actor. actor does not exist, only actor-v18 and actor-v13. Is v18 the correct one to link to?

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