[Doc] Check markup links

.github/workflows/check_markup_links.yml

@@ -0,0 +1,19 @@
+name: Check markup links
+on:
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: tcort/github-action-markdown-link-check@v1
+      with:
+        folder-path: 'docs'
+        file-path: README.md
+        check-modified-files-only: yes
+        base-branch: main
+        use-quiet-mode: yes
+        use-verbose-mode: yes

docs/lang/articles/reference/differences_between_taichi_and_python_programs.md

@@ -6,7 +6,7 @@ sidebar_position: 5
 
 Although Taichi uses Python as the frontend, it follows a different set of rules in many aspects, including:
 
-1. [Taichi only supports return statement outside non-static `if`/`for`/`while` scope in the program](#return-statement)
+1. [Taichi only supports return statement outside non-static `if`/`for`/`while` scope in the program](#return-statement-and-return-type-annotation)
 2. [Variables defined inside an `if`/`for`/`while` block cannot be accessed outside the block.](#variable-scoping)
 3. [Taichi does not fully support some language features of Python.](#unsupportedpartially-supported-python-language-features)