Update argument_parsing.h using snake case

userprog/argument_parsing.h

@@ -14,9 +14,9 @@ int parse_arguments(const char* command_line, char***argv);
  * Given stack pointer `esp`, argument count `argc` and arguments array `argv`,
  * Populates the stack pointed to by the stack pointer with the given arguments.
  * esp is the initial stack pointer from process.c,
- * I have used stackPointer as the name as that makes sense inside populate_stack,
- * In process.c esp has been renamed to initialStackPointer
+ * I have used stackPointer as the name as that makes sense inside,
+ * populate_stack, in process.c esp has been renamed to initial_stack_pointer
  */
-void populate_stack(void** stackPointer, int argc, char** argv);
+void populate_stack(void** stack_pointer, int argc, char** argv);
 
 #endif /* userprog/argument_parsing.h */