lib: Fix broken link to Cross.toml.

src/lib.rs

@@ -899,7 +899,7 @@ macro_rules! commit_info {
     };
 }
 
-/// Obtains the [`CrossToml`] from one of the possible locations
+/// Obtains the [`CrossToml`][1] from one of the possible locations
 ///
 /// These locations are checked in the following order:
 /// 1. If the `CROSS_CONFIG` variable is set, it tries to read the config from its value
@@ -908,6 +908,8 @@ macro_rules! commit_info {
 ///
 /// The values from `CROSS_CONFIG` or `Cross.toml` are concatenated with the
 /// metadata in `Cargo.toml`, with `Cross.toml` having the highest priority.
+///
+/// [1]: https://github.com/har7an/cross/blob/docs/restructure-docs-folder/docs/config_file.md
 pub fn toml(metadata: &CargoMetadata, msg_info: &mut MessageInfo) -> Result<CrossToml> {
     let root = &metadata.workspace_root;
     let cross_config_path = match env::var("CROSS_CONFIG") {