remove a strange statement that was simply wrong from the docs

documentation/src/main/asciidoc/userguide/chapters/query/hql/QueryLanguage.adoc

@@ -330,6 +330,7 @@ include::{sourcedir}/HQLTest.java[tags=hql-string-literals-example]
 ----
 ====
 
+[[hql-numeric-literals]]
 ==== Numeric literals
 
 Numeric literals come in several different forms.
@@ -605,10 +606,7 @@ include::{sourcedir}/HQLTest.java[tags=hql-searched-case-expressions-example]
 ----
 ====
 
-[[hql-case-arithmetic-expressions]]
-===== Case expressions with arithmetic operations
-
-Any arithmetic operation in the `case` expression must be enclosed in parentheses, as illustrated by the following example:
+A `case` expression may contain complex expression, including operator expressions:
 
 [[hql-case-arithmetic-expressions-example]]
 //.Case expression with arithmetic operation example
@@ -619,12 +617,6 @@ include::{sourcedir}/HQLTest.java[tags=hql-case-arithmetic-expressions-example]
 ----
 ====
 
-[IMPORTANT]
-====
-If the arithmetic expression was not enclosed in parentheses, the parser would be unable to parse the expression.
-====
-
-
 [[hql-exp-functions]]
 === Functions
 

documentation/src/test/java/org/hibernate/userguide/hql/HQLTest.java

@@ -2135,7 +2135,7 @@ public class HQLTest extends BaseEntityManagerFunctionalTestCase {
 			List<Long> values = entityManager.createQuery(
 				"select " +
 				"	case when p.nickName is null " +
-				"		 then (p.id * 1000) " +
+				"		 then p.id * 1000 " +
 				"		 else p.id " +
 				"	end " +
 				"from Person p " +