Improving usability of having many nearly-identical methods

[mathstuf]

@DragonDev1906

Extension: Allow specifying the name it should be shown under, instead of using the primary function name: #[group("sort", primary, display_name="sort*")], that way rustdoc has an easier time to indicate that there are multiple variants of this function.

See this pre-RFC thread:

Pre-RFC: allow to merge inherent impl blocks in the HTML

Summary Allow to merge various impl blocks in the HTML output Motivation There is only one usecase in mind – currently RustDoc generates separate impl docs for every impl block. Example: Screenshot Implementing this RFC would allow to merge said blocks into one by using new #[doc(merge)] attribute (they will be separate if said block won't be specified). Guide-level explanation I guess it would go there – The #[doc] attribute - The rustdoc book. Something along the lines of: At the item l…