docs(rustdoc): document that JS/TS checks run under tidy (eslint, es-check, tsc)

Author: ali90h

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.repository == 'rust-lang/rustc-dev-guide'
     runs-on: ubuntu-latest
     env:
-      MDBOOK_VERSION: 0.4.52
+      MDBOOK_VERSION: 0.4.48
       MDBOOK_LINKCHECK2_VERSION: 0.9.1
       MDBOOK_MERMAID_VERSION: 0.12.6
       MDBOOK_OUTPUT__LINKCHECK__FOLLOW_WEB_LINKS: ${{ github.event_name != 'pull_request' }}

src/contributing.md

@@ -370,9 +370,6 @@ You can also use `rustdoc` directly to check small fixes. For example,
 `rustdoc src/doc/reference.md` will render reference to `doc/reference.html`.
 The CSS might be messed up, but you can verify that the HTML is right.
 
-Please notice that at this time we don't accept typography/spellcheck fixes to **internal documentation** (example:
-tests, library or compiler code) as it's usually not worth the churn or the review time.
-
 ### Contributing to rustc-dev-guide
 
 Contributions to the [rustc-dev-guide] are always welcome, and can be made directly at

src/rustdoc.md

@@ -60,6 +60,17 @@ does is call the `main()` that's in this crate's `lib.rs`, though.)
 * Use `./x test tests/rustdoc*` to run the tests using a stage1
   rustdoc.
   * See [Rustdoc internals] for more information about tests.
+* Use `./x test tidy --extra-checks=js` to run ESLint/TSC checks on rustdoc's frontend code.
+
+### Frontend CI checks
+
+Rustdoc's JavaScript and TypeScript are checked by ESLint and `tsc` during CI, not by compiletest. These run as part of the tidy job:
+
+```bash
+./x.py test tidy --extra-checks=js
+```
+
+The `--extra-checks=js` flag enables the frontend linting that runs in CI.
 
 [`bootstrap.toml`]: ./building/how-to-build-and-run.md