Update procedural-macros.md

Fix typo

diff --git a/src/doc/book/src/procedural-macros.md b/src/doc/book/src/procedural-macros.md
index d286c3b7bdc633fd4b67b1f7c39073080339450a..6c4700f9305ca296243f9a7dd44d4318871d6c05 100644 (file)
--- a/src/doc/book/src/procedural-macros.md
+++ b/src/doc/book/src/procedural-macros.md
@@ -99,7 +99,7 @@ created, we'll add it to our toml:
 hello-world-derive = { path = "hello-world-derive" }
 ```
 
-As for our the source of our `hello-world-derive` crate, here's an example:
+As for the source of our `hello-world-derive` crate, here's an example:
 
 ```rust,ignore
 extern crate proc_macro;