Fix some Rustdoc links.

crates/tor-guardmgr/src/fallback.rs

@@ -51,7 +51,7 @@ impl FallbackDir {
         FallbackDirBuilder::default()
     }
 
-    /// Return a copy of this FallbackDir as a [`Guard`](crate::Guard)
+    /// Return a copy of this FallbackDir as a [`FirstHop`](crate::FirstHop)
     pub fn as_guard(&self) -> crate::FirstHop {
         crate::FirstHop {
             id: FallbackId::from_chan_target(self).into(),

crates/tor-guardmgr/src/fallback/set.rs

-//! Declare the [`FallbackSet`] type, which is used to store a set of FallbackDir.
+//! Declare the [`FallbackState`] type, which is used to store a set of FallbackDir.
 
 use rand::seq::IteratorRandom;
 use std::time::Instant;

crates/tor-guardmgr/src/guard.rs

@@ -572,7 +572,7 @@ impl Guard {
         dir.weight_by_rsa_id(&self.id.0.rsa, tor_netdir::WeightRole::Guard)
     }
 
-    /// Return a [`crate::Guard`] object to represent this guard.
+    /// Return a [`FirstHop`](crate::FirstHop) object to represent this guard.
     pub(crate) fn get_external_rep(&self) -> crate::FirstHop {
         crate::FirstHop {
             id: self.id.clone().into(),

crates/tor-guardmgr/src/lib.rs

@@ -436,7 +436,7 @@ impl<R: Runtime> GuardMgr<R> {
 
     /// Select a guard for a given [`GuardUsage`].
     ///
-    /// On success, we return a [`GuardId`] object to identify which
+    /// On success, we return a [`FirstHopId`] object to identify which
     /// guard we have picked, a [`GuardMonitor`] object that the
     /// caller can use to report whether its attempt to use the guard
     /// succeeded or failed, and a [`GuardUsable`] future that the
@@ -966,7 +966,7 @@ impl GuardMgrInner {
     /// Helper: Select a fallback directory.
     ///
     /// Called when we have no guard information to use. Return values are as
-    /// for [`select_guard()`]
+    /// for [`GuardMgr::select_guard()`]
     fn select_fallback(
         &self,
         now: Instant,