Update compiler/rustc_borrowck/src/eliminate_placeholders.rs

Co-authored-by: lcnr <[email protected]>

Author: amandasystems

compiler/rustc_borrowck/src/eliminate_placeholders.rs

@@ -73,9 +73,9 @@ pub(crate) struct RegionTracker {
     /// This includes placeholders within this SCC.
     max_placeholder_universe_reached: UniverseIndex,
 
-    /// The smallest universe nameable from this SCC.
-    /// It is the smallest of all the largest nameable universes
-    /// of any region reachable from it.
+    /// The largest universe nameable from this SCC.
+    /// It is the smallest nameable universes of all
+    /// existential regions reachable from it.
     max_nameable_universe: UniverseIndex,
 
     /// The representative Region Variable Id for this SCC.