commit 041ae901cccdb321d584a644724480bd076ddcf5
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu May 30 11:13:00 2019 +0100

    Update documentation of implementation-defined library features
    
            * doc/xml/manual/status_cxx2011.xml: Use <variablelist> for
            documentation of implementation-defined types for [thread.req.native].
            * doc/xml/manual/status_cxx2017.xml: Update documentation of
            implementation-defined strings for [variant.bad.access]. Fix typo in
            documentation of implementation-defined support for [fs.conform.9945].
            * doc/html/*: Regenerate.

diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2011.xml b/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
index 9c25b8fd81f..6f3551ff65d 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
@@ -2793,31 +2793,44 @@ particular release.
       is subject to change at any time. Any use of
       <classname>native_handle</classname> is inherently non-portable and
       not guaranteed to work between major releases of GCC.
-      <itemizedlist>
-         <listitem><para><classname>thread</classname>: The native handle type is
-            a typedef for <code>__gthread_t</code> i.e. <code>pthread_t</code>
-            when GCC is configured with the <literal>posix</literal> thread
-            model. The value of the native handle is undefined for a thread
+      <variablelist>
+      <varlistentry>
+         <term><classname>thread</classname></term>
+         <listitem>
+            The native handle type is a typedef for <code>__gthread_t</code>
+            i.e. <code>pthread_t</code> when GCC is configured with the
+            <literal>posix</literal> thread model.
+            The value of the native handle is undefined for a thread
             which is not joinable.
-         </para></listitem>
-         <listitem><para><classname>mutex</classname> and
-            <classname>timed_mutex</classname>:
+         </listitem>
+      </varlistentry>
+      <varlistentry>
+         <term><classname>mutex</classname></term>
+         <term><classname>timed_mutex</classname></term>
+         <listitem>
             The native handle type is <code>__gthread_mutex_t*</code> i.e.
             <code>pthread_mutex_t*</code> for the <literal>posix</literal>
             thread model.
-         </para></listitem>
-         <listitem><para><classname>recursive_mutex</classname> and
-         <classname>recursive_timed_mutex</classname>:
+         </listitem>
+      </varlistentry>
+      <varlistentry>
+         <term><classname>recursive_mutex</classname></term>
+         <term><classname>recursive_timed_mutex</classname></term>
+         <listitem>
             The native handle type is <code>__gthread_recursive_mutex_t*</code>
             i.e. <code>pthread_mutex_t*</code> for the <literal>posix</literal>
             thread model.
-         </para></listitem>
-         <listitem><para><classname>condition_variable</classname>: The native
-            handle type is <code>__gthread_cond_t*</code> i.e.
+         </listitem>
+      </varlistentry>
+      <varlistentry>
+         <term><classname>condition_variable</classname></term>
+         <listitem>
+            The native handle type is <code>__gthread_cond_t*</code> i.e.
             <code>pthread_cond_t*</code> for the <literal>posix</literal>
             thread model.
-         </para></listitem>
-      </itemizedlist>
+         </listitem>
+      </varlistentry>
+      </variablelist>
    </para>
 
    <para>
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
index a11e93cda90..9aba079c251 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
@@ -1043,7 +1043,11 @@ and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
 
    <para>
       <emphasis>23.7.10 [variant.bad.access]</emphasis>
-      <code>what()</code> returns <literal>"Unexpected index"</literal>.
+      <code>what()</code> returns one of the strings
+      <literal>"std::get: variant is valueless"</literal>,
+      <literal>"std::get: wrong index for variant"</literal>,
+      <literal>"std::visit: variant is valueless"</literal>,
+      or <literal>"std::visit&lt;R&gt;: variant is valueless"</literal>.
    </para>
 
    <para>
@@ -1117,7 +1121,7 @@ and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
    <para>
       <emphasis>30.10.2.1 [fs.conform.9945]</emphasis>
       The behavior of the filesystem library implementation will depend on
-      the target operating system. Some features will not be not supported
+      the target operating system. Some features will not be supported
       on some targets.
    </para>