Fix broken rustdoc links

Author: rami3l

src/dist/dist.rs

@@ -43,8 +43,9 @@ static TOOLCHAIN_CHANNELS: &[&str] = &[
 ];
 
 /// Returns a error message indicating that certain [`Component`]s are missing in a toolchain distribution.
+///
 /// This message is currently used exclusively in toolchain-wide operations,
-/// otherwise [`component_unavailable_msg`](`crate::errors::component_unavailable_msg`) will be used.
+/// otherwise [`component_unavailable_msg`](../../errors/fn.component_unavailable_msg.html) will be used.
 ///
 /// # Panics
 /// This function will panic when the collection of unavailable components `cs` is empty.

src/errors.rs

@@ -141,6 +141,9 @@ fn suggest_message(suggestion: &Option<String>) -> String {
 
 /// Returns a error message indicating that certain [`Component`]s are unavailable.
 ///
+/// See also [`component_missing_msg`](../dist/dist/fn.components_missing_msg.html)
+/// which generates error messages for component unavailability toolchain-wide operations.
+///
 /// # Panics
 /// This function will panic when the collection of unavailable components `cs` is empty.
 fn component_unavailable_msg(cs: &[Component], manifest: &Manifest, toolchain: &str) -> String {