Rewrap description of SocketAddrV4 textual format.

Author: nmathewson

library/core/src/net/socket_addr.rs

@@ -52,10 +52,9 @@ pub enum SocketAddr {
 /// # Textual representation
 ///
 /// `SocketAddrV4` provides a [`FromStr`](crate::str::FromStr) implementation.
-/// It accepts an IPv4 address in its [textual representation],
-/// followed by a single `:`,
-/// followed by the port encoded as a decimal integer.
-/// Other formats are not accepted.
+/// It accepts an IPv4 address in its [textual representation], followed by a
+/// single `:`, followed by the port encoded as a decimal integer.  Other
+/// formats are not accepted.
 ///
 /// [textual representation]: Ipv4Addr#textual-representation
 ///