chore: remove special char from plugin description

Author: lppedd

plugin-description.html

@@ -1,6 +1,6 @@
 <p>
   This plugin provides code style customization for
-  <strong>infix</strong> and <strong>operator</strong> (math & keyword) functions.
+  <strong>infix</strong> and <strong>operator</strong> (math and keyword) functions.
 </p>
 <br/>
 <p>