Update coding guidelines

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3000 65c4cc65-6c06-0410-ace0-fbb531ad65f3

doc/CODING-GUIDELINES

@@ -49,10 +49,25 @@ if (foo) {
 
 Case statements:
 switch (foo) {
-	case BAR:
+case BAR:
 	blah();
 	break;
-	case OTHER:
+case OTHER:
 	other();
 	break;
 }
+
+No nested statements without braces, e.g. no:
+
+for (x=0;x<5;x++)
+	if (foo) 
+		if (bar)
+			baz();
+
+instead do:
+for (x=0;x<5;x++) {
+	if (foo) {
+		if (bar)
+			baz();
+	}
+}