Make links in documentation work with commonmark

This fixes formatting problems when the Markdown processor is switched
to pulldown-cmark (rust-lang/rust#44229).

Author: mbrubeck

src/sip.rs

@@ -19,23 +19,23 @@ use core::slice;
 
 /// An implementation of SipHash 1-3.
 ///
-/// See: https://131002.net/siphash/
+/// See: <https://131002.net/siphash/>
 #[derive(Debug, Clone, Copy, Default)]
 pub struct SipHasher13 {
     hasher: Hasher<Sip13Rounds>,
 }
 
 /// An implementation of SipHash 2-4.
 ///
-/// See: https://131002.net/siphash/
+/// See: <https://131002.net/siphash/>
 #[derive(Debug, Clone, Copy, Default)]
 pub struct SipHasher24 {
     hasher: Hasher<Sip24Rounds>,
 }
 
 /// An implementation of SipHash 2-4.
 ///
-/// See: https://131002.net/siphash/
+/// See: <https://131002.net/siphash/>
 ///
 /// SipHash is a general-purpose hashing function: it runs at a good
 /// speed (competitive with Spooky and City) and permits strong _keyed_