[SYCL][Doc] Remove obsolete parens from README (#1637)

Signed-off-by: Artem Gindinson <artem.gindinson@intel.com>

Author: Artem Gindinson

README.md

@@ -6,7 +6,7 @@ Intel staging area for llvm.org contribution.
 Home for Intel LLVM-based projects:
  - oneAPI Data Parallel C++ compiler - see **sycl** branch. More information on
    oneAPI and DPC++ is available at
-([https://www.oneapi.com/](https://www.oneapi.com/))
+[https://www.oneapi.com/](https://www.oneapi.com/)
    - [![Linux Post Commit Checks](https://github.com/intel/llvm/workflows/Linux%20Post%20Commit%20Checks/badge.svg)](https://github.com/intel/llvm/actions?query=workflow%3A%22Linux+Post+Commit+Checks%22)
    [![Generate Doxygen documentation](https://github.com/intel/llvm/workflows/Generate%20Doxygen%20documentation/badge.svg)](https://github.com/intel/llvm/actions?query=workflow%3A%22Generate+Doxygen+documentation%22)