cpp: delete a mistaken note on ParseOptions() documentation

ParseOptions() function does not return any value (its type is void).

--
Change-Id: I7e3b818169a304cc2ad6c8d1580ce010b7d79d12
Reviewed-on: https://bazel-review.googlesource.com/#/c/2740/
MOS_MIGRATED_REVID=112762600
diff --git a/src/main/cpp/blaze.cc b/src/main/cpp/blaze.cc
index a6cf377..e29790c 100644
--- a/src/main/cpp/blaze.cc
+++ b/src/main/cpp/blaze.cc
@@ -1296,7 +1296,6 @@
 }
 
 // Parse the options, storing parsed values in globals.
-// Returns the index of the first non-option argument.
 static void ParseOptions(int argc, const char *argv[]) {
   string error;
   blaze_exit_code::ExitCode parse_exit_code =