[SYCL][Driver] Align -fsycl help message with the rest (#972)

Capitalize and remove the dot at the end.

Signed-off-by: Sergey Semenov <[email protected]>

Author: sergey-semenov

clang/include/clang/Driver/Options.td

@@ -1815,7 +1815,7 @@ def fstrict_overflow : Flag<["-"], "fstrict-overflow">, Group<f_Group>;
 def fintelfpga : Flag<["-"], "fintelfpga">, Group<f_Group>,
   Flags<[CC1Option, CoreOption]>, HelpText<"Perform ahead of time compilation for FPGA">;
 def fsycl : Flag<["-"], "fsycl">, Group<f_Group>, Flags<[CC1Option, NoArgumentUnused, CoreOption]>,
-  HelpText<"generate SYCL code.">;
+  HelpText<"Generate SYCL code">;
 def fno_sycl : Flag<["-"], "fno-sycl">, Group<f_Group>, Flags<[NoArgumentUnused, CoreOption]>;
 def fsycl_device_only : Flag<["-"], "fsycl-device-only">, Flags<[CoreOption]>,
   HelpText<"Compile SYCL kernels for device">;