book/zkas: Correct some links.

book/src/zkas/bincode.md

@@ -36,8 +36,8 @@ TBD
 ```
 
 Integers in the binary are encoded using variable-integer encoding.
-See [`serial.rs`](../../../src/util/serial.rs) for our Rust
-implementation.
+See [`serial.rs`](https://github.com/darkrenaissance/darkfi/blob/master/src/util/serial.rs)
+for our Rust implementation.
 
 ## `MAGIC_BYTES`
 

zkas/README.md

@@ -5,10 +5,10 @@ zkas is a compiler for the Halo2 zkVM langage used in
 [DarkFi](https://github.com/darkrenaissance/darkfi).
 
 The documentation on both the compiler and the language can be found
-in the book: https://darkrenaissance.github.io/darkfi/zkas/zkas.html
+in the book: <https://darkrenaissance.github.io/darkfi/zkas/zkas.html>
 
 The current implementation found in the DarkFi repository inside
-https://github.com/darkrenaissance/darkfi/tree/master/zkas is the
+<https://github.com/darkrenaissance/darkfi/tree/master/zkas> is the
 reference compiler and language implementation. It is a toolchain
 consisting of a lexer, parser, static and semantic analyzers, and a
 binary code compiler.