[clang] [clang][doc][SYCL] Expand SYCL driver release notes (PR #200449)

[Nick Sarnie via cfe-commits]

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@@ -945,10 +945,28 @@ OpenMP Support
 
 SYCL Support
 ------------
+- SYCL compilations now default to ``-std=c++17`` when no explicit language
+  standard is specified. Standards below C++17 are rejected with a diagnostic.
+
 - Clang now assumes default target for SYCL device compilation is 64-bit SPIR-V
   and it now diagnoses if a non-supporting target is specified via command line.
   (#GH167358)
 
+- The SYCL runtime shared library has been renamed from ``libsycl.so`` to
+  ``libLLVMSYCL.so`` to align with LLVM naming conventions. SYCL header include
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sarnex wrote:

Should the second sentence here be a separate item or is it related to the library name?

https://github.com/llvm/llvm-project/pull/200449