Make blank lines before sections consistent

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index 4d3ae57..04eb37f 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -500,7 +500,6 @@
 names provided by the 1.0 specification instead.
 
 
-
 ## Changes that only affect alternative implementations
 
 ### Internal / alt-focused headers were moved to a private location
@@ -527,7 +526,6 @@
 implement those additional five API functions.
 
 
-
 ## X.509
 
 ### Remove the certs module from the library
@@ -601,6 +599,7 @@
 
 This is described in the section (Strengthen default algorithm selection for X.509 and TLS)[strengthen-default-algorithm-selection-for-x.509-and-tls].
 
+
 ## SSL
 
 ### Remove support for TLS 1.0, 1.1 and DTLS 1.0