Additional formatting changes

pdftk basic usage.md

@@ -1,3 +1,5 @@
+# Basic Usage
+
 To merge (concatenate) pdfs:
 
     $ pdftk inputs cat output newfile.pdf
@@ -17,7 +19,7 @@ To combine parts of two or more files, use handles:
 
     $ pdftk A=firstfile.pdf B=secondfile.pdf cat A1-7 B1-5 A8 output newfile.pdf
 
-========================================================================
+# Editing Metadata
 
 To edit metadata is a multistep process:
 
@@ -34,6 +36,7 @@ InfoValue: Kenneth John Odle
 InfoBegin
 InfoKey: Title
 InfoValue: Journal #42
+```
 
 (For "Title" enter whatever you want to see in the document's title bar as you read it.)
 
@@ -46,7 +49,9 @@ Thus, make the file you save the scan as different than what you want the final
 
 See https://sejh.wordpress.com/2014/11/26/changing-pdf-titles-with-pdftk/
 
-========================================================================
+# Converting to Double Sided Scans without a Duplexer
+
+This is not an issue if your document scanner has a duplexing unit.
 
 To shuffle pages (interleave double-sided originals):