improve format of 2006/stewart//index.html

Improved indenting of information in a code block.

Ran `bin/readme2index.sh -v 1 2006/stewart/` to perform the above.

2006/stewart/README.md

@@ -66,8 +66,7 @@ where:
 
 ```
     m   = The size of the picture (picture will be m X m in size).
-    n   = The number of iterations to run (More will make for a
-	 clearer picture).
+    n   = The number of iterations to run (More will make for a clearer picture).
     ifs = The file to use as input.
 ```