Merge pull request #335 from clemp6r/SPR-10850

# By clemp6r
* SPR-10850:
  Fix elvis operator mistake in reference docs

src/reference/docbook/expressions.xml

@@ -980,7 +980,7 @@ StandardEvaluationContext context = new StandardEvaluationContext(tesla);
 
 String name = parser.parseExpression("Name?:'Elvis Presley'").getValue(context, String.class);
 
-System.out.println(name); // Mike Tesla
+System.out.println(name); // Nikola Tesla
 
 tesla.setName(null);