[gcc r16-5498] libstdc++: fix dead links in doc

[Yuao Ma]

https://gcc.gnu.org/g:fe3c8455d0709751d23617303a1bf9311f888153

commit r16-5498-gfe3c8455d0709751d23617303a1bf9311f888153
Author: Yuao Ma <c8ef@outlook.com>
Date:   Fri Nov 21 23:35:44 2025 +0800

    libstdc++: fix dead links in doc
    
    libstdc++-v3/ChangeLog:
    
            * doc/html/manual/using_exceptions.html: Replace dead link.
            * doc/xml/manual/using_exceptions.xml: Likewise.

Diff:
---
 libstdc++-v3/doc/html/manual/using_exceptions.html | 2 +-
 libstdc++-v3/doc/xml/manual/using_exceptions.xml   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/doc/html/manual/using_exceptions.html b/libstdc++-v3/doc/html/manual/using_exceptions.html
index 9b53e3688ae7..a810a3499ad9 100644
--- a/libstdc++-v3/doc/html/manual/using_exceptions.html
+++ b/libstdc++-v3/doc/html/manual/using_exceptions.html
@@ -330,7 +330,7 @@ is called.
 	The Open Group/The Institute of Electrical and Electronics
 	Engineers, Inc.
       . </span></p></div><div class="biblioentry"><a id="id-1.3.3.4.9.10.3"></a><p><span class="title"><em>
-	<a class="link" href="https://www.boost.org/community/error_handling.html" target="_top">
+	<a class="link" href="https://www.boost.org/doc/libs/1_34_1/more/error_handling.html" target="_top">
 	Error and Exception Handling
 	</a>
       </em>. </span><span class="author"><span class="firstname">David</span> <span class="surname">Abrahams </span>. </span><span class="publisher"><span class="publishername">
diff --git a/libstdc++-v3/doc/xml/manual/using_exceptions.xml b/libstdc++-v3/doc/xml/manual/using_exceptions.xml
index c46cff201f17..fbcc679bd4d4 100644
--- a/libstdc++-v3/doc/xml/manual/using_exceptions.xml
+++ b/libstdc++-v3/doc/xml/manual/using_exceptions.xml
@@ -528,7 +528,7 @@ is called.
   <biblioentry>
       <title>
 	<link xmlns:xlink="http://www.w3.org/1999/xlink"
-	      xlink:href="https://www.boost.org/community/error_handling.html">
+	      xlink:href="https://www.boost.org/doc/libs/1_34_1/more/error_handling.html">
 	Error and Exception Handling
 	</link>
       </title>