[release-branch.go1.21] spec: remove unnecessary sentence

Change-Id: I06345199ff16c80be83c345d734caef1714ec089
Reviewed-on: https://go-review.googlesource.com/c/go/+/515338
TryBot-Bypass: Robert Griesemer <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>
Auto-Submit: Robert Griesemer <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/515715

Author: griesemer

doc/go_spec.html

@@ -1,6 +1,6 @@
 <!--{
 	"Title": "The Go Programming Language Specification",
-	"Subtitle": "Version of July 31, 2023",
+	"Subtitle": "Version of Aug 2, 2023",
 	"Path": "/ref/spec"
 }-->
 
@@ -8464,9 +8464,6 @@ <h3 id="Type_unification_rules">Type unification rules</h3>
 		In this case, if <code>T</code> is a defined type, <code>T</code>
 		replaces <code>A</code> as the inferred type argument for <code>P</code>.
 	</li>
-	<li>
-		In all other cases unification of <code>P</code> and <code>T</code> fails.
-	</li>
 	</ul>
 </li>
 </ul>