Update syscall_exit.c

userprog/syscall_exit.c

+/*
+ * Terminates the current user program, returning status to the kernel. If the
+ * Process’s parent waits for it (see below), this is the status that will be
+ * Returned. Conventionally, a status of 0 indicates success and nonzero values
+ * Indicate errors.
+ *
+ * Authored by Alex Stratford
+ */
+
 #include "system_calls.h"
 #include "threads/interrupt.h" // Dependency for intr_frame struct
 #include "threads/thread.h" // Dependency for thread struct