Rustdoc render inconsistency

[lifthrasiir]

There are a number of inconsistencies in the current rustdoc renders, including:

• The method listing for structs/enums has a different look from that for traits. For example, the method heading for structs/enums is bolder than that for traits (font-weight: 600 vs. font-weight: 400).
• Several non-generated headings (e.g. "Required Methods" in the trait) don't have a link to self.
• Why is the stability index rendered as <a> instead of <span>?
• Item listings in the module should have one-line descriptions, but sometimes descriptions span more than one line (e.g. std::kinds::marker). I suspect that's because code has white-space: pre-wrap attribute everywhere; .docblock.short code { white-space: nowrap; } seems to solve that (not sure).

[adrientetar]

cc me

[adrientetar]

I added a fix for part 1 and part 4 of #13804 as part of #13776. #13802 takes care of the rest?

[steveklabnik]

I believe that all of these have been addressed with @adrientetar 's PRs. Please open more issues if not!