[SYCL][NFC] Update configure.py documentation to match the --werror option (#6096)

* The former --no-werror has been replaced by an opposite --werror option.
* Fix back-tick typo

Author: keryell

sycl/doc/GetStartedGuide.md

@@ -117,11 +117,11 @@ You can use the following flags with `configure.py` (full list of available
 flags can be found by launching the script with `--help`):
 
 * `--system-ocl` -> Don't download OpenCL headers and library via CMake but use the system ones
-* `--no-werror` -> Don't treat warnings as errors when compiling llvm
+* `--werror` -> treat warnings as errors when compiling LLVM
 * `--cuda` -> use the cuda backend (see [Nvidia CUDA](#build-dpc-toolchain-with-support-for-nvidia-cuda))
 * `--hip` -> use the HIP backend (see [HIP](#build-dpc-toolchain-with-support-for-hip-amd))
 * `--hip-platform` -> select the platform used by the hip backend, `AMD` or `NVIDIA` (see [HIP AMD](#build-dpc-toolchain-with-support-for-hip-amd) or see [HIP NVIDIA](#build-dpc-toolchain-with-support-for-hip-nvidia))
-* '--enable-esimd-emulator' -> enable ESIMD CPU emulation (see [ESIMD CPU emulation](#build-dpc-toolchain-with-support-for-esimd-cpu))
+* `--enable-esimd-emulator` -> enable ESIMD CPU emulation (see [ESIMD CPU emulation](#build-dpc-toolchain-with-support-for-esimd-cpu))
 * `--shared-libs` -> Build shared libraries
 * `-t` -> Build type (debug or release)
 * `-o` -> Path to build directory