Fix typo and identation with tabs

exec/tdfiglet.js

@@ -21,7 +21,7 @@ function usage() {
 	writeln("    -f [font] Specify font file used.");
 	writeln("    -j l|r|c  Justify left, right, or center. Default is left.");
 	writeln("    -w n      Set screen width. Default is auto-detect or 80.");
-	wrintln("    -m n      Set margin/offset (for left or right justification).");
+	writeln("    -m n      Set margin/offset (for left or right justification).");
 	writeln("    -a        Color sequences: ANSI. Default is Synchronet Ctrl-A.");
 	writeln("    -u        Encode charaters as UTF-8. Default is CP437.");
 	writeln("    -x n      Index to font within file. Default is 0.");