[CI][Doc] Adapt GitHub Actions to an increased number of documentation files (#3933)

Additionally fix minor error in clang documentation.

Author: Alexander Batashev

.github/workflows/gh_pages.yml

@@ -41,12 +41,9 @@ jobs:
         git rm -rf .
         touch .nojekyll
         yes | \cp -rf $GITHUB_WORKSPACE/build/tools/sycl/doc/html/* .
-        mkdir doxygen
-        yes | \cp -rf $GITHUB_WORKSPACE/build/tools/sycl/doc/doxygen/html/* doxygen/
-        mkdir clang
-        yes | \cp -rf $GITHUB_WORKSPACE/build/tools/clang/docs/html/* clang/
-        mkdir clang_doxygen
-        yes | \cp -rf $GITHUB_WORKSPACE/build/tools/clang/docs/doxygen/html/* clang_doxygen/
+        mv $GITHUB_WORKSPACE/build/tools/sycl/doc/doxygen/html doxygen/
+        mv $GITHUB_WORKSPACE/build/tools/clang/docs/html clang/
+        mv $GITHUB_WORKSPACE/build/tools/clang/docs/doxygen/html clang_doxygen/
         git config --global user.name "iclsrc"
         git config --global user.email "[email protected]"
         git add .

clang/docs/LanguageExtensions.rst

@@ -2453,7 +2453,7 @@ their usual pattern without any special treatment.
   constexpr const char * __builtin_sycl_unique_stable_name( type-id );
 
 ``__builtin_sycl_unique_stable_id``
-----------------------------------
+-----------------------------------
 
 Like ``__builtin_sycl_unique_stable_name``, this builtin generates a unique and
 stable name as a string literal to support sharing it across split compliations.