Add link to docs.rs for cairo-lang-macro (#1496)

commit-id:f1a5ffa4

---

**Stack**:
- #1497
- #1496 ⬅


⚠️ *Part of a stack created by [spr](https://github.com/ejoffe/spr). Do
not merge manually using the UI - doing so may have unexpected results.*

website/docs/reference/procedural-macro.md

@@ -12,6 +12,12 @@ In general, this allows writing expressions (`macro!()`), attributes (`#[macro]`
 macros (`#[derive(Macro)]`) that transform Cairo code in your package.
 This transformations can be loaded dynamically per compilation unit as dependencies.
 
+### Procedural macro API interface
+
+<BigLink href="https://docs.rs/cairo-lang-macro">
+Go to cairo-lang-macro documentation on docs.rs
+</BigLink>
+
 ## Guide-level explanation
 
 ### Procedural macro user perspective
@@ -126,6 +132,8 @@ These three macro helpers are:
 3. #[`derive_macro`] - Implements a derive macro. Should be used on function that accepts single token stream, the item
  the derive is applied to. Note that derives cannot replace the original item, but rather add new items to the module.
 
+Please review the [`cairo-lang-macro` documentation](https://docs.rs/cairo-lang-macro) for more information.
+
 ### Parsing token streams
 
 To parse Cairo code, you can use the `cairo-lang-parser` crate, defined in the Cairo compiler repository and available