Added explanation of last schema commit.

sql/database-migrate.txt

@@ -380,4 +380,6 @@ last_net_act,last_cpu_act,last_ext_act);
 	all such information belongs. Average size of an entry is 30
 	bytes. We can squeeze this down easily by making the "action"
 	a tinyint instead varchar, but not gonna worry until the table
-	is over 1MB. 
\ No newline at end of file
+	is over 1MB. 
+
+1.137: Minor file formatting changes, no DB schema changes