[gcc r16-8304] libstdc++: Delete superseded comment

[Nathan Myers]

https://gcc.gnu.org/g:8df8a196f7d9786716df5583023c347c61dea5cb

commit r16-8304-g8df8a196f7d9786716df5583023c347c61dea5cb
Author: Nathan Myers <ncm@cantrip.org>
Date:   Fri Mar 27 11:37:39 2026 -0400

    libstdc++: Delete superseded comment
    
    A comment referring to nothing remained in a patch.
    
    libstdc++-v3/ChangeLog:
            * include/bits/stl_tree.h: Delete comment.

Diff:
---
 libstdc++-v3/include/bits/stl_tree.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index 632df6d4bfc0..a7781b72114a 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -3274,11 +3274,6 @@ namespace __rb_tree
       }
 
 #ifdef __glibcxx_associative_heterogeneous_insertion  // C++26
-
-  // If __pos.second == &_M_impl._M_header, insert at root;
-  // else if __pos.first == __pos.second, insert at __pos.second._M_left;
-  // else insert at __pos.second._M_right, and rebalance.
-
   template <typename _Key, typename _Val, typename _KeyOfValue,
 	    typename _Compare, typename _Alloc>
     template <typename... _Args>