fix 404 url in src/doc/rustdoc.md

[cuishuang]

fix 404 url in src/doc/rustdoc.md

The previous link will lead to a 404 page.

[rustbot]

r? @GuillaumeGomez

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[GuillaumeGomez]

Thanks!

@bors r+ rollup

[rust-bors]

📌 Commit f98529c has been approved by GuillaumeGomez

It is now in the queue for this repository.

[rust-log-analyzer]

The job aarch64-gnu-llvm-21-2 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:end] 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 } -- 0.134
[TIMING:end] tool::Linkchecker { compiler: Compiler { stage: 0, host: aarch64-unknown-linux-gnu, forced_compiler: false }, target: aarch64-unknown-linux-gnu } -- 0.000
##[group]Testing stage1 Linkcheck (aarch64-unknown-linux-gnu)
rustdoc.html:32: broken link - `rustdoc/src`
checked links in: 25.0s
number of HTML files scanned: 62478
number of HTML redirects found: 22211
number of links checked: 2983528
number of links ignored due to external: 184531
number of links ignored due to exceptions: 31
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 `/checkout/obj/build/aarch64-unknown-linux-gnu/stage1-tools-bin/linkchecker /checkout/obj/build/aarch64-unknown-linux-gnu/doc` failed with exit code 1
Created at: src/bootstrap/src/core/build_steps/tool.rs:1624:23
Executed at: src/bootstrap/src/core/build_steps/test.rs:202:77

Command has failed. Rerun with -v to see more details.
Bootstrap failed while executing `--stage 2 test --skip tidy --skip library/stdarch/crates/intrinsic-test --skip src/tools/rust-analyzer --skip tests --skip library --skip tidyselftest`
Currently active steps:
test::Linkcheck { host: aarch64-unknown-linux-gnu } at src/bootstrap/src/core/build_steps/test.rs:139
Build completed unsuccessfully in 0:32:01
  local time: Tue Jul 28 16:35:02 UTC 2026

[JonathanBrouwer]

💔 I suspect this PR failed tests as part of a rollup
@bors r-

After fixing the problem, consider running a try job for the failed job before re-approving.

Link to failure: #160089 (comment)

[rust-bors]

This pull request was unapproved.

This PR was contained in a rollup (#160089), which was unapproved.

View changes since this unapproval