Update rustdoc.md to point to correct file.

[przb]

Noticed the link was broken, Found what seemed like a reasonable file to point to instead.

[rustbot]

r? @GuillaumeGomez

rustbot has assigned @GuillaumeGomez.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[GuillaumeGomez]

Thanks!

@bors r+ rollup

[bors]

📌 Commit e8108d3 has been approved by GuillaumeGomez

It is now in the queue for this repository.

[rust-log-analyzer]

The job aarch64-gnu-llvm-19-2 failed! Check out the build log: (web) (plain enhanced) (plain)

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

##[endgroup]
[TIMING] core::build_steps::tool::ToolBuild { build_compiler: Compiler { stage: 0, host: aarch64-unknown-linux-gnu, forced_compiler: false }, target: aarch64-unknown-linux-gnu, tool: "linkchecker", path: "src/tools/linkchecker", mode: ToolBootstrap, source_type: InTree, extra_features: [], allow_features: "", cargo_args: [], artifact_kind: Binary } -- 0.157
[TIMING] core::build_steps::tool::Linkchecker { compiler: Compiler { stage: 0, host: aarch64-unknown-linux-gnu, forced_compiler: false }, target: aarch64-unknown-linux-gnu } -- 0.000
##[group]Testing stage0 Linkcheck (aarch64-unknown-linux-gnu)
rustdoc.html:31: broken link - `rustdoc/src/SUMMARY.md`
checked links in: 22.7s
number of HTML files scanned: 46023
number of HTML redirects found: 14501
number of links checked: 2528157
number of links ignored due to external: 98344
number of links ignored due to exceptions: 24
number of intra doc links ignored: 9
errors found: 1
found some broken links
NOTE: if you are adding or renaming a markdown file in a mdBook, don't forget to register the page in SUMMARY.md
Command has failed. Rerun with -v to see more details.
Build completed unsuccessfully in 0:34:05
  local time: Sun Aug  3 15:39:17 UTC 2025
  network time: Sun, 03 Aug 2025 15:39:17 GMT
##[error]Process completed with exit code 1.
Post job cleanup.

[GuillaumeGomez]

@bors r-

[slanterns]

I guess in the final output what you want is not a markdown file?

[przb]

Could you maybe clarify what your question? The previous link to rustdoc/index.html does not exist anymore. I was perusing the codebase and it sent me to a 404 page. It seemed to me like it should link to the rustdoc src directory, so I updated the link.

[slanterns]

Actually the link is not broken, it just doesn't work on Github md preview (but works fine on the website.) Other pages also include similar links e.g. https://github.com/rust-lang/rust/blob/master/src/doc/guide-unsafe.md. Changing it to pointing to a md file will result in an invalid link on the website.

[przb]

Good catch @slanterns. Closing this PR then