Fix typos in comments

Author: shravanrn

code/include/rlbox_policy_types.hpp

@@ -45,14 +45,14 @@ class sandbox_callback
   T_Callback callback;
 
   // The interceptor is the function that runs between the sandbox invoking the
-  // callback and the actual callback running The interceptor is responsible for
-  // wrapping and converting callback arguments, returns etc. to their
+  // callback and the actual callback running. The interceptor is responsible
+  // for wrapping and converting callback arguments, returns etc. to their
   // appropriate representations
   using T_Interceptor = decltype(
     callback_detail::interceptor_type_helper<T_Sbx>(std::declval<T>()));
   T_Interceptor callback_interceptor;
 
-  // The trampoline is the internal sandbox representation of the callback
+  // The trampoline is the internal sandbox representation of the callback.
   // Depending on the sandbox type, this could be the callback pointer directly
   // or a trampoline function that gates exits from the sandbox.
   using T_Trampoline = detail::convert_to_sandbox_equivalent_t<T, T_Sbx>;