Edited ch06.asciidoc with Atlas code editor

ch06.asciidoc

@@ -560,7 +560,7 @@ That signature is a serialized byte-stream of the +R+ and +S+ values produced by
 * +0x45+—the length of the sequence (69 bytes)
   * +0x02+—an integer value follows
   * +0x21+—the length of the integer (33 bytes)
-  * +R+—+00884d142d86652a3f47ba4746ec719bbfbd040a570b1deccbb6498c75c4ae24cb+
+  * +R+—++00884d142d86652a3f47ba4746ec719bbfbd040a570b1deccbb6498c75c4ae24cb++
   * +0x02+—another integer follows
   * +0x20+—the length of the integer (32 bytes)
   * +S+—++4b9f039ff08df09cbe9f6addac960298cad530a863ea8f53982c09db8f6e3813++
@@ -667,9 +667,7 @@ Note that in verifying the signature, the private key is neither known nor revea
 
 [TIP]
 ====
-The math of ECDSA is complex and difficult to understand. There are a number of great guides online that might help. Search for "ECDSA explained" or try this one:
-
-http://www.instructables.com/id/Understanding-how-ECDSA-protects-your-data/?ALLSTEPS
+The math of ECDSA is complex and difficult to understand. There are a number of great guides online that might help. Search for "ECDSA explained" or try this one: http://www.instructables.com/id/Understanding-how-ECDSA-protects-your-data/?ALLSTEPS[]
 ====
 
 ==== The Importance of Randomness in Signatures