[gcc r17-248] libstdc++: Suppress Doxygen docs for internals in <bits/locale_conv.h>

[Jonathan Wakely]

https://gcc.gnu.org/g:59cf910a43dca038ddab7655215171577e1df238

commit r17-248-g59cf910a43dca038ddab7655215171577e1df238
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri May 1 12:36:20 2026 +0100

    libstdc++: Suppress Doxygen docs for internals in <bits/locale_conv.h>
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/locale_conv.h: Prevent namespace __detail from
            being documented as part of the Locales topic.

Diff:
---
 libstdc++-v3/include/bits/locale_conv.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libstdc++-v3/include/bits/locale_conv.h b/libstdc++-v3/include/bits/locale_conv.h
index b331d7d67327..5ef557cc1e1f 100644
--- a/libstdc++-v3/include/bits/locale_conv.h
+++ b/libstdc++-v3/include/bits/locale_conv.h
@@ -48,6 +48,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
    * @{
    */
 
+  /// @cond undocumented
+
   template<typename _OutStr, typename _InChar, typename _Codecvt,
 	   typename _State, typename _Fn>
     bool
@@ -255,6 +257,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	_Tp* _M_ptr;
       };
   }
+  /// @endcond
 
 _GLIBCXX_BEGIN_NAMESPACE_CXX11