Fix unused doc warning in Rust 1.35 (#2863)

This version brings a new warning to inform that rustdoc doesn't add docs for macro
expansions

p2p/src/msg.rs

@@ -47,9 +47,9 @@ const OTHER_MAGIC: [u8; 2] = [73, 43];
 const FLOONET_MAGIC: [u8; 2] = [83, 59];
 const MAINNET_MAGIC: [u8; 2] = [97, 61];
 
-/// Types of messages.
-/// Note: Values here are *important* so we should only add new values at the
-/// end.
+// Types of messages.
+// Note: Values here are *important* so we should only add new values at the
+// end.
 enum_from_primitive! {
 	#[derive(Debug, Clone, Copy, PartialEq)]
 	pub enum Type {

p2p/src/store.rs

@@ -28,7 +28,7 @@ const STORE_SUBPATH: &'static str = "peers";
 
 const PEER_PREFIX: u8 = 'P' as u8;
 
-/// Types of messages
+// Types of messages
 enum_from_primitive! {
 	#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 	pub enum State {

p2p/src/types.rs

@@ -333,7 +333,7 @@ bitflags! {
 	}
 }
 
-/// Types of connection
+// Types of connection
 enum_from_primitive! {
 	#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 	pub enum Direction {
@@ -342,7 +342,7 @@ enum_from_primitive! {
 	}
 }
 
-/// Ban reason
+// Ban reason
 enum_from_primitive! {
 	#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 	pub enum ReasonForBan {