[skip-revcheck] fixed typo (#1187)

Author: mowangjuanzi

language/control-structures/else.xml

@@ -60,7 +60,7 @@ else
    Despite the indentation (which does not matter for PHP), the <literal>else</literal>
    is associated with the <literal>if ($b)</literal>, so the example does not produce
    any output. While relying on this behavior is valid, it is recommended to avoid
-   it by using curly braces to resolve potential ambuigities.
+   it by using curly braces to resolve potential ambiguities.
   </para>
  </note>
 </sect1>