fix up issues with internal compiler docs revealed by stricter lint

compiler/rustc_mir_transform/src/elaborate_drop.rs

@@ -611,6 +611,7 @@ fn drop_ladder_bottom(&mut self) -> (BasicBlock, Unwind, Option<BasicBlock>) {
     ///
     /// For example, with 3 fields, the drop ladder is
     ///
+    /// ```text
     /// .d0:
     ///     ELAB(drop location.0 [target=.d1, unwind=.c1])
     /// .d1:
@@ -621,8 +622,10 @@ fn drop_ladder_bottom(&mut self) -> (BasicBlock, Unwind, Option<BasicBlock>) {
     ///     ELAB(drop location.1 [target=.c2])
     /// .c2:
     ///     ELAB(drop location.2 [target=`self.unwind`])
+    /// ```
     ///
     /// For possible-async drops in coroutines we also need dropline ladder
+    /// ```text
     /// .d0 (mainline):
     ///     ELAB(drop location.0 [target=.d1, unwind=.c1, drop=.e1])
     /// .d1 (mainline):
@@ -637,6 +640,7 @@ fn drop_ladder_bottom(&mut self) -> (BasicBlock, Unwind, Option<BasicBlock>) {
     ///     ELAB(drop location.1 [target=.e2, unwind=.c2])
     /// .e2 (dropline):
     ///     ELAB(drop location.2 [target=`self.drop`, unwind=`self.unwind`])
+    /// ```
     ///
     /// NOTE: this does not clear the master drop flag, so you need
     /// to point succ/unwind on a `drop_ladder_bottom`.

compiler/rustc_thread_pool/src/sleep/mod.rs

@@ -44,7 +44,7 @@ pub(super) fn deadlock_check(&self, deadlock_handler: &Option<Box<DeadlockHandle
 /// jobs are published, and it either blocks threads or wakes them in response to these
 /// events. See the [`README.md`] in this module for more details.
 ///
-/// [`README.md`] README.md
+/// [`README.md`]: README.md
 pub(super) struct Sleep {
     /// One "sleep state" per worker. Used to track if a worker is sleeping and to have
     /// them block.