Fix toggleComment signature in the manual

Closes codemirror#5654.

Author: adrianheine

doc/manual.html

@@ -2478,7 +2478,7 @@ <h2 id="addons">Addons</h2>
       <dd>Addon for commenting and uncommenting code. Adds four
       methods to CodeMirror instances:
       <dl>
-        <dt id="toggleComment"><code><strong>toggleComment</strong>(from: {line, ch}, to: {line, ch}, ?options: object)</code></dt>
+        <dt id="toggleComment"><code><strong>toggleComment</strong>(?options: object)</code></dt>
         <dd>Tries to uncomment the current selection, and if that
         fails, line-comments it.</dd>
         <dt id="lineComment"><code><strong>lineComment</strong>(from: {line, ch}, to: {line, ch}, ?options: object)</code></dt>