doc/go_spec.html: fix broken anchor tag

LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/99420045

doc/go_spec.html

@@ -4014,7 +4014,7 @@ precision.
 <h3 id="Order_of_evaluation">Order of evaluation</h3>
 
 <p>
-At package level, <a href="#Program_execution"</a>initialization dependencies</a>
+At package level, <a href="#Program_execution">initialization dependencies</a>
 determine the evaluation order of individual initialization expressions in
 <a href="#Variable_declarations">variable declarations</a>.
 Otherwise, when evaluating the <a href="#Operands">operands</a> of an