Use a more conventional spelling of "breakpoint".

sys/mips/mips/trap.c

@@ -849,7 +849,7 @@ trap(struct trapframe *trapframe)
 			}
 			/*
 			 * The restoration of the original instruction and
-			 * the clearing of the berakpoint will be done later
+			 * the clearing of the breakpoint will be done later
 			 * by the call to ptrace_clear_single_step() in
 			 * issignal() when SIGTRAP is processed.
 			 */