Update the help file for exporting all palettes

res/help.html

@@ -107,6 +107,6 @@ <h1>)" PROGRAM_NAME R"(</h1>
 <li>Hold Ctrl, left-click and drag one color onto another to copy it.</li>
 </ul>
 <p>Ctrl+C, Ctrl+V, and Ctrl+X will copy, paste, and swap colors respectively, just like they do for blocks and tiles in their own editor dialogs.</p>
-<p>Edited palette colors can be exported, but only one at a time; so if you load a multi-palette .pal file (like bg_tiles.pal, which defines MORN, DAY, NITE, and INDOOR palettes' colors), do not overwrite it when exporting your edits.</p>
+<p>You can export the edited colors of all the palettes at once to a single .pal file. Do not overwrite an existing file with this; instead, copy+paste only the palettes you need. For example, bg_tiles.pal defines MORN, DAY, NITE, and INDOOR palettes (as well as separate WATER colors for MORN/DAY and NITE), and ice_path.pal defines a CUSTOM palette.</p>
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 </html>)"