Fix comment

Author: kurapov-peter

oclhelpers.hpp

@@ -39,7 +39,7 @@ void build(cl::Program &program, cl::Device &device);
 /*
 The program is compiled with the default device on default platform.
 Usage example:
-    auto [platform, device, program] =
+    auto [platform, device, context, program] =
         compile_file_with_defaults("kernel.cl");
 */
 std::tuple<cl::Platform, cl::Device, cl::Context, cl::Program>
@@ -60,4 +60,4 @@ template <class... Ts> inline void set_args(cl::Kernel &k, const Ts &... args) {
 }
 std::string get_error_string(int error);
 
-} // namespace oclhelpers
+} // namespace oclhelpers