Fix comment

compiler/rustc_middle/src/query/mod.rs

@@ -1164,8 +1164,7 @@ rustc_queries! {
     }
 
     /// Check whether the function has any recursion that could cause the inliner to trigger
-    /// a cycle. Returns the call stack causing the cycle. The call stack does not contain the
-    /// current function, just all intermediate functions.
+    /// a cycle.
     query mir_callgraph_reachable(key: (ty::Instance<'tcx>, LocalDefId)) -> bool {
         fatal_cycle
         desc { |tcx|