Change search "not found" links

[kaleidawave]

This PR adds an additional link to the not found section on the search page in the rustdoc output. This new link points to https://docs.rs/releases/search?q=*input*.

The use case is that I keep going to find an external item when unintentionally on https://doc.rust-lang.org/stable/std/. This provides a quicker way to where I actually want to search docs.rs.

This also shows the current crate name in the section to remind the user what crate is being searched.

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A concern is that the docs.rs search is by crate name, not by actual items. Maybe the message should be Search crates matching *query*

[rust-log-analyzer]

The job mingw-check-tidy failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Checking tidy rustdoc_json... Running eslint on rustdoc JS files /checkout/src/librustdoc/html/static/js/search.js 4922:1 error This line has a length of 105. Maximum allowed is 100 max-len 4923:1 error This line has a length of 107. Maximum allowed is 100 max-len ✖ 2 problems (2 errors, 0 warnings) eslint command failed `rustdoc-json-types` was not modified. tidy: Skipping binary file check, read-only filesystem ##[error]tidy error: /checkout/src/librustdoc/html/static/js/search.js:4922: line longer than 100 chars ##[error]tidy error: /checkout/src/librustdoc/html/static/js/search.js:4923: line longer than 100 chars removing old virtual environment creating virtual environment at '/checkout/obj/build/venv' using 'python3.10' and 'venv' creating virtual environment at '/checkout/obj/build/venv' using 'python3.10' and 'virtualenv' Requirement already satisfied: pip in ./build/venv/lib/python3.10/site-packages (25.1.1) linting python files All checks passed! checking python file formatting 28 files already formatted checking C++ file formatting some tidy checks failed Command has failed. Rerun with -v to see more details. Build completed unsuccessfully in 0:01:21 local time: Sun Jun 22 09:39:11 UTC 2025 network time: Sun, 22 Jun 2025 09:39:11 GMT ##[error]Process completed with exit code 1. Post job cleanup. 

[lolbinarycat]

Suggested change

	const duckduckgoURL = `https://duckduckgo.com/?q=${encodeURIComponent("rust " + query.userQuery)}`;
	const duckduckgoURL = `https://duckduckgo.com/?q=${encodeURIComponent("rust lang " + query.userQuery)}`;

While we're here we should probably disambiguate so people don't get results about the game (this happens to me sometimes)

[lolbinarycat]

we can apply some simple heuristics to hide this when it would be unhelpful. for example, if query.hasReturnArrow is true, we're doing type-based search, like u8 -> u16, which probably won't give much help.

[Dylan-DPC]

@kaleidawave any updates on this? thanks