doc: reword to avoid the confusing term 'anew'

Fixes #34415

Change-Id: I8eaa7606ae01e569a076cf7f3c28dbec2a153001
Reviewed-on: https://go-review.googlesource.com/c/go/+/196578Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

doc/effective_go.html

@@ -624,7 +624,7 @@ if it has already been declared, provided:
 <li>this declaration is in the same scope as the existing declaration of <code>v</code>
 (if <code>v</code> is already declared in an outer scope, the declaration will create a new variable §),</li>
 <li>the corresponding value in the initialization is assignable to <code>v</code>, and</li>
-<li>there is at least one other variable in the declaration that is being declared anew.</li>
+<li>there is at least one other variable that is created by the declaration.</li>
 </ul>
 
 <p>