Docs: improve class references linking in functions.rst

[m-aciek]

With Linklint we link only first reference in a paragraph. Explicitly leave only reference which is expected to link.

In dict, frozendict, frozenset and set reference docs.

Before:

After:

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #32981211 | 📁 Comparing 96954f7 against main (7a468a1)

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± library/functions.html

[hugovk]

Thanks!

@nedbat Although I wonder if linklint could prefer linking the instances in a "See x [and y]" sentence, or would that be unreliable?

[nedbat]

As I read these paragraphs, I wonder what value these sentences actually add:

• "The [dict] object is the dictionary class."
• "[frozenset] is a built-in class."

About linklint: it's an interesting idea to preserve links in "See ..." sentences. I wonder if it is reliable enough, and if there are other sentence structures to consider. Also, what about translations?