developer/going-further/important-rfcs.md: cleanup

Change-Id: I33cc33b0655af5b24a07b8bdff6671a4fa3af6a0

developer/going-further/important-rfcs.md

-Important RFCs
-==============
+# Important RFCs
 
 ## SIP
 
@@ -7,7 +6,7 @@ Reference: <http://tools.ietf.org/html/rfc3261>
 
 Valuable updates and extensions:
 
-+  SIP Re-INVITE: <http://tools.ietf.org/html/rfc6141>
+* SIP Re-INVITE: <http://tools.ietf.org/html/rfc6141>
 
 ## ICE
 
@@ -24,9 +23,8 @@ Reference: <http://tools.ietf.org/html/rfc4566>
 How to use SDP: <http://tools.ietf.org/html/rfc3264>
 Valuable updates and extensions:
 
-+  SDP and IPv6: <http://tools.ietf.org/html/rfc6157>
-+  SDP for SRTP: <http://tools.ietf.org/html/rfc4568>
-
+* SDP and IPv6: <http://tools.ietf.org/html/rfc6157>
+* SDP for SRTP: <http://tools.ietf.org/html/rfc4568>
 
 ## RTP
 
@@ -34,8 +32,7 @@ Reference: <http://tools.ietf.org/html/rfc3550>
 
 Valuable updates and extensions:
 
-+  RTP and RTCP on same port: <http://tools.ietf.org/html/rfc5761>
-
+* RTP and RTCP on the same port: <http://tools.ietf.org/html/rfc5761>
 
 ## SRTP
 
@@ -43,6 +40,6 @@ Reference: <http://tools.ietf.org/html/rfc3711>
 
 Valuable updates and extensions:
 
-+  DTLS for SRTP: <https://tools.ietf.org/html/rfc5763> et <http://tools.ietf.org/html/rfc5764>
-+  AES-192 and AES-256: <https://tools.ietf.org/html/rfc6188>
-+  AES-GCM: <https://tools.ietf.org/html/rfc7714>
+* DTLS for SRTP: <https://tools.ietf.org/html/rfc5763> et <http://tools.ietf.org/html/rfc5764>
+* AES-192 and AES-256: <https://tools.ietf.org/html/rfc6188>
+* AES-GCM: <https://tools.ietf.org/html/rfc7714>
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