Add mention of reserved include paths

Mention sycl/ext/ and sycl/backend/ include paths under include files section.
KhronosGroup · Apr 19, 2024 · ae2ee82 · ae2ee82
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commit ae2ee82
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diff --git a/source/header-file.rst b/source/header-file.rst
@@ -25,4 +25,7 @@ another header file:
 which can be used in place of ``sycl/sycl.hpp``, providing all of the same SYCL
 programming API, though it is recommended to use ``sycl/sycl.hpp``.
 
+Extension headers are available in ``sycl/ext/`` include paths and backend-
+specific headers are available in ``sycl/backend/`` include paths.
+
 .. seealso:: |SYCL_SPEC_HEADER_FILES|