Update doc based on review comment

Signed-off-by: Soumi Manna <[email protected]>

Author: smanna12

clang/include/clang/Basic/AttrDocs.td

@@ -2421,7 +2421,7 @@ device kernel, the attribute is not ignored and it is propagated to the kernel.
 If the`` intel::reqd_work_group_size`` or ``cl::reqd_work_group_size``
 attribute is specified on a declaration along with a
 intel::num_simd_work_items attribute, the work group size attribute
-argument (X argument) must be evenly divisible by the argument specified
+argument (the first argument) must be evenly divisible by the argument specified
 in the ``intel::num_simd_work_items`` attribute.
 
 .. code-block:: c++