📝 Update help for substitution case-sensitivity

Author: richardfrost

src/static/optionPage.html

@@ -618,7 +618,10 @@ <h1 id="words">Words</h1>
     <li>Modify existing words/phrases.</li>
     <li>Remove existing words/phrases.</li>
     <li>Configure <code>match repeated characters</code> in words.</li>
-    <li>Set the substitution (replacement) for a word/phrase (Only when filter in <code>Substitution</code> mode).</li>
+    <li>Set the substitution (replacement) for a word/phrase (Only when filter in <code>Substitution</code> mode).<ul>
+    <li>Case-sensitive: The substitution will respect the provided case (Example: <code>DoG</code>). (Note: <em>This supersedes the <code>preserveCase</code> option for the current word</em>)</li>
+    </ul>
+    </li>
     <li>Words/phrases can also be added by selecting them on a web page and then choosing the <code>Add selection to filter</code> option from the context (right-click) menu. New words will use the settings found in the &quot;Default Settings (for new word/phrases)&quot; section.</li>
     <li>Match repeated characters - Match words with repeated characters (must still be in same order).</li>
     <li>Match separators - Words/phrases that contain (<code>&#39;-&#39;, &#39;_&#39; &amp; &#39; &#39;</code>) inside them will be filtered.</li>