Sync docs: Text/Labels/ENVVARS -> EXTENDING re: fonts

docs/en/ENVVARS.txt

@@ -125,3 +125,7 @@ may be used by the "Text" and "Label" tools.
     the location of the user's configuration files. It is used to find a
     user-specific "fonts.conf" configuration file.
      
+
+⚙ See the "Extending Tux Paint" documentation for information on where Tux
+Paint searches for fonts.
+

docs/en/README.txt

@@ -6,7 +6,7 @@
         Copyright © 2002-2025 by various contributors; see AUTHORS.txt.
                              https://tuxpaint.org/
 
-                                 May 26, 2025
+                                 June 8, 2025
 
 +-------------------------------------------------+
 |                Table of Contents                |
@@ -480,6 +480,9 @@ e."Text" and "Label" Tools ←
     font, color, and styling while entering the text, before it is applied to
     the canvas.)
 
+    ⚙ See the "Extending Tux Paint" documentation for information on where Tux
+    Paint searches for fonts.
+
     Press [Enter] or [Return] and the text will be drawn onto the picture and
     the cursor will move down one line.
 

docs/en/html/ENVVARS.html

@@ -231,6 +231,9 @@
         On Linux and other platforms where the X Desktop Group standards are used, the location of the user's configuration files. It is used to find a user-specific "<code>fonts.conf</code>" configuration file.      </dd>
     </dl>
 
+    <p class="note">
+      <span title="Configuration option">&#9881;</span>      See the "<a href="EXTENDING.html"><em>Extending Tux Paint</em></a>" documentation for information on where Tux Paint searches for fonts.    </p>
+
   </body>
 </html>
 

docs/en/html/README.html

@@ -102,7 +102,7 @@
           </p>
 
           <p>
-            May 26, 2025          </p>
+            June  8, 2025          </p>
         </center>
       </header>
       <table border="2"
@@ -813,6 +813,9 @@
   <p>
     Choose a font (from the 'Letters' available on the right) and a color (from the color palette near the bottom). You may also apply a bold, and/or an italic styling effect to the text. Click on the screen and a cursor will appear. Type text and it will show up on the screen. (You can change the font, color, and styling while entering the text, before it is applied to the canvas.)  </p>
 
+  <p class="note">
+    <span title="Configuration option">&#9881;</span>    See the "<a href="EXTENDING.html"><em>Extending Tux Paint</em></a>" documentation for information on where Tux Paint searches for fonts.  </p>
+
   <p>
     Press <b><code>[Enter]</code></b> or <b><code>[Return]</code></b> and the text will be drawn onto the picture and the cursor will move down one line.  </p>