Fix typo

src/config.xml

@@ -3076,7 +3076,7 @@ to be found in the default search path.
     <option type='string' id='DOT_FONTNAME' format='string' defval='Helvetica' depends='HAVE_DOT'>
       <docs>
 <![CDATA[
- When you want a differently looking font n the dot files that doxygen generates
+ When you want a differently looking font in the dot files that doxygen generates
  you can specify the font name 
  using \c DOT_FONTNAME. You need to make sure dot is able to find the font, 
  which can be done by putting it in a standard location or by setting the