Mention 'nostereo' option in the FAQ

docs/en/FAQ.txt

@@ -5,7 +5,7 @@
         Copyright (c) 2002-2020 by various contributors; see AUTHORS.txt
                             http://www.tuxpaint.org/
 
-                       September 14, 2002 - July 27, 2020
+                     September 14, 2002 - October 30, 2020
 
 Drawing-related
 
@@ -394,6 +394,17 @@ Audio Problems
                  or desktop icon.
                * Recompile Tux Paint with sound support disabled. (See above
                  and INSTALL.txt.)
+     * The stereo panning of sound effects is bothersome; can sound effects
+       be monophonic?
+
+       Run Tux Paint with the "no stereo" option:
+
+          * Use Tux Paint Config to uncheck the "Enable Stereo Sound" option
+            (under "Video & Sound").
+          * Edit Tux Paint's configuration file (see OPTIONS for details) and
+            add a line containing "nostereo=yes".
+          * Run "tuxpaint --nostereo" from the command line or shortcut or
+            desktop icon.
      * The sound effects sound strange
 
        This could have to do with how SDL and SDL_mixer were initialized.

docs/en/html/FAQ.html

@@ -32,7 +32,7 @@
       </p>
 
       <p>
-        September 14, 2002 - July 27, 2020
+        September 14, 2002 - October 30, 2020
       </p>
     </center>
 
@@ -776,6 +776,28 @@
         </ul>
       </li>
 
+      <li>
+        <em>The stereo panning of sound effects is bothersome; can sound
+        effects be monophonic?</em>
+        <p>
+          Run Tux&nbsp;Paint with the "no&nbsp;stereo" option:
+        </p>
+        <ul>
+          <li>Use Tux&nbsp;Paint&nbsp;Config to uncheck the
+          "Enable Stereo Sound" option (under "Video &amp; Sound").
+          </li>
+
+          <li>Edit Tux&nbsp;Paint's configuration file (see
+          <a href="OPTIONS.html">OPTIONS</a> for details) and
+          add a line containing "<code>nostereo=yes</code>".
+          </li>
+
+          <li>Run "<code>tuxpaint&nbsp;--nostereo</code>" from
+          the command line or shortcut or desktop icon.
+          </li>
+        </ul>
+      </li>
+
       <li>
         <em>The sound effects sound strange</em>
         <p>