Fix typo 03-create-pallet.md (#2067)

Fix typo: "marco" to "macro"

Co-authored-by: Shawn Tabrizi <[email protected]>

Author: juandesouza

content/md/en/docs/tutorials/collectibles-workshop/03-create-pallet.md

@@ -141,7 +141,7 @@ The next step is to prepare a set of common macros to serve as scaffolding for y
 
    You now have a clean slate for creating the Substrate collectibles pallet.
 
-2. Prepare the scaffolding for the Substrate collectibles pallet by adding the following common set of marco declarations to the `src/lib.rs`  file:
+2. Prepare the scaffolding for the Substrate collectibles pallet by adding the following common set of macro declarations to the `src/lib.rs`  file:
 
    ```rust
    #![cfg_attr(not(feature = "std"), no_std)]