Fix typo in cl_kernel_arg_type_qualifier (#778)

Author: Alexx999

xml/cl.xml

@@ -873,7 +873,7 @@ server's OpenCL/api-docs repository.
             <unused start="6" end="31"/>
     </enums>
 
-    <enums name="cl_kernel_arg_type_qualifer" vendor="Khronos" type="bitmask">
+    <enums name="cl_kernel_arg_type_qualifier" vendor="Khronos" type="bitmask">
         <enum value="0"             name="CL_KERNEL_ARG_TYPE_NONE"/>
         <enum bitpos="0"            name="CL_KERNEL_ARG_TYPE_CONST"/>
         <enum bitpos="1"            name="CL_KERNEL_ARG_TYPE_RESTRICT"/>