an attempt at simpler yet more correct semicolon rules.

(i'd be happy to drop the paren one as well, reducing it to one case)

DELTA=4  (0 added, 3 deleted, 1 changed)
OCL=27058
CL=27060

doc/go_spec.html

@@ -3011,10 +3011,7 @@ which may be omitted only if the previous statement:
 <ul>
 	<li>ends with the closing parenthesis ")" of a list of declarations
 	    (§Declarations and Scope); or</li>
-	<li>ends with the closing brace "}" of a type declaration
-	    (§Type declarations); or </li>
-	<li>ends with the closing brace "}" of a block
-	    (including "switch" and "select" statements).
+	<li>ends with a closing brace "}" that is not part of an expression.
 </ul>