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.
 ```
 

2006/stewart/index.html

@@ -186,8 +186,7 @@ a reasonably experienced user who can parse formats in their mind. :-)</p>
 <pre><code>    ./stewart &lt;m&gt; &lt;n&gt; &lt;ifs&gt;</code></pre>
 <p>where:</p>
 <pre><code>    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.</code></pre>
 <p>The program will spit out an <a href="https://en.wikipedia.org/wiki/X_BitMap">XBM image</a>
 on standard out. Minimal checking is done on the arguments mainly that there