rustdoc: Fix a couple of issues with the search results
* Fix links to static items in the search results.
* Don't include the path for primitive methods in the search results. Displaying `std::u32::max_value` is misleading so just display `u32::max_value`.
print enum variant fields in docs
Right now we are repeating enum variants at the top, because the fields aren't shown with the actual docs. It's very annoying to have to scroll up and down to have both docs and field info. For struct variants we already list the fields.
enum docs look like this after this PR:

There are degenerate cases for enum tuple variants with lots of fields:

I was thinking that we could move the docs below the variant (slightly indented) or list the variant fields vertically instead of horizontally
r? @steveklabnik
This enables `*` in all type positions in doc searches, which I often
want in order to find functions that create or convert specific
types (e.g. `* -> vec`) but I don't actually know what kinds of input
they expect.
I actually started working on this because of #31598, but I've wanted it
several times when exploring new crates.
The output of rustdoc includes resources licensed under the SIL Open
Font License, the MIT license, and the Apache License 2.0. All of these
licenses permit redistribution provided that the license text is also
redistributed. Previously this was not the case, making rustdoc output
unsuitable for distribution by default. This resolves that problem by
including the license texts in rustdoc output.
See also: https://users.rust-lang.org/t/licensing-rustdoc-output/2880
Previously only keyup event was looked at, which meant that pasting, cutting and
otherwise changing the input without typing would not catch any updates to the
search query.
The output of rustdoc includes resources licensed under the SIL Open
Font License, the MIT license, and the Apache License 2.0. All of these
licenses permit redistribution provided that the license text is also
redistributed. Previously this was not the case, making rustdoc output
unsuitable for distribution by default. This resolves that problem by
including the license texts in rustdoc output.
history.pushState is defined, but not working whenever document.origin is "null"
(literally that string, not just the null object).
This is due to some security considerations and is unlikely to be ever working.
For now just disable the usage of the history API when the documentation
is accessed through a file:/ URL.
See https://code.google.com/p/chromium/issues/detail?id=301210 for a
Chrome-specific issue on the history API on file:/ URLs
Closes#25953