update readme

README.md

@@ -23,8 +23,8 @@ pdfScale.sh v2.0.3 - Paper Sizes
      Inches |     11.7 x 8.3
 ```
 #### Scale by 0.95 (-5%)
-##### This also shows a very special case of PDF file that has no `/MediaBox` defined.
-##### It is a dumb container of n-up binary PDF pages. So, `grep` fails on this one.
+This also shows a very special case of a PDF file that has no `/MediaBox` defined.  
+It is a dumb container of n-up binary PDF pages. So, `grep` fails on this one.
 ```
 $ pdfscale -v ../input-nup.pdf
 pdfscale v2.0.2 - Verbose Execution