Polish documentation for SpEL Elvis operator

Author: sbrannen

framework-docs/modules/ROOT/pages/core/expressions/language-ref/operator-elvis.adoc

@@ -1,10 +1,10 @@
 [[expressions-operator-elvis]]
 = The Elvis Operator
 
-The Elvis operator is a shortening of the ternary operator syntax and is used in the
-https://www.groovy-lang.org/operators.html#_elvis_operator[Groovy] language. With the
-ternary operator syntax, you often have to repeat a variable twice, as the following
-Java example shows:
+The Elvis operator (`?:`) is a shortening of the ternary operator syntax and is used in
+the https://www.groovy-lang.org/operators.html#_elvis_operator[Groovy] language. With the
+ternary operator syntax, you often have to repeat a variable twice, as the following Java
+example shows:
 
 [source,java,indent=0,subs="verbatim,quotes"]
 ----
@@ -23,7 +23,7 @@ Java::
 ----
 	ExpressionParser parser = new SpelExpressionParser();
 
-	String name = parser.parseExpression("name?:'Unknown'").getValue(new Inventor(), String.class);
+	String name = parser.parseExpression("name ?: 'Unknown'").getValue(new Inventor(), String.class);
 	System.out.println(name);  // 'Unknown'
 ----
 
@@ -33,7 +33,7 @@ Kotlin::
 ----
 	val parser = SpelExpressionParser()
 
-	val name = parser.parseExpression("name?:'Unknown'").getValue(Inventor(), String::class.java)
+	val name = parser.parseExpression("name ?: 'Unknown'").getValue(Inventor(), String::class.java)
 	println(name)  // 'Unknown'
 ----
 ======
@@ -58,11 +58,11 @@ Java::
 	EvaluationContext context = SimpleEvaluationContext.forReadOnlyDataBinding().build();
 
 	Inventor tesla = new Inventor("Nikola Tesla", "Serbian");
-	String name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String.class);
+	String name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String.class);
 	System.out.println(name);  // Nikola Tesla
 
 	tesla.setName("");
-	name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String.class);
+	name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String.class);
 	System.out.println(name);  // Elvis Presley
 ----
 
@@ -74,11 +74,11 @@ Kotlin::
 	val context = SimpleEvaluationContext.forReadOnlyDataBinding().build()
 
 	val tesla = Inventor("Nikola Tesla", "Serbian")
-	var name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String::class.java)
+	var name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String::class.java)
 	println(name)  // Nikola Tesla
 
 	tesla.setName("")
-	name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String::class.java)
+	name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String::class.java)
 	println(name)  // Elvis Presley
 ----
 ======