typo fix

Author: steveklabnik

_posts/2018-10-25-Rust-1.30.0.md

@@ -44,7 +44,7 @@ And convert a `Pet` to and from JSON because `serde_json` defined `Serialize` an
 `Deserialize` in a procedural macro.
 
 Rust expands on this by adding the ability to define two other kinds of
-advanced macros, "attribute-like procedrual macros" and "function-like
+advanced macros, "attribute-like procedural macros" and "function-like
 procedural macros."
 
 Attribute-like macros are similar to custom derive macros, but instead of generating code