Replace <code> with {@code} throughout Javadoc

Issue: SPR-10128

spring-expression/src/main/java/org/springframework/expression/BeanResolver.java

@@ -18,7 +18,7 @@ package org.springframework.expression;
 
 /**
  * A bean resolver can be registered with the evaluation context
- * and will kick in for <code>@myBeanName</code> still expressions.
+ * and will kick in for {@code @myBeanName} still expressions.
  *
  * @author Andy Clement
  * @since 3.0.3

spring-expression/src/main/java/org/springframework/expression/ConstructorResolver.java

@@ -32,7 +32,7 @@ public interface ConstructorResolver {
 	/**
 	 * Within the supplied context determine a suitable constructor on the supplied type that can handle the
 	 * specified arguments. Return a ConstructorExecutor that can be used to invoke that constructor
-	 * (or <code>null</code> if no constructor could be found).
+	 * (or {@code null} if no constructor could be found).
 	 * @param context the current evaluation context
 	 * @param typeName the type upon which to look for the constructor
 	 * @param argumentTypes the arguments that the constructor must be able to handle

spring-expression/src/main/java/org/springframework/expression/MethodResolver.java

@@ -32,7 +32,7 @@ public interface MethodResolver {
 	/**
 	 * Within the supplied context determine a suitable method on the supplied object that can handle the
 	 * specified arguments. Return a MethodExecutor that can be used to invoke that method
-	 * (or <code>null</code> if no method could be found).
+	 * (or {@code null} if no method could be found).
 	 * @param context the current evaluation context
 	 * @param targetObject the object upon which the method is being called
 	 * @param argumentTypes the arguments that the constructor must be able to handle

spring-expression/src/main/java/org/springframework/expression/TypedValue.java

@@ -21,7 +21,7 @@ import org.springframework.core.convert.TypeDescriptor;
 /**
  * Encapsulates an object and a type descriptor that describes it.
  * The type descriptor can hold generic information that would not be
- * accessible through a simple <code>getClass()</code> call on the object.
+ * accessible through a simple {@code getClass()} call on the object.
  *
  * @author Andy Clement
  * @author Juergen Hoeller

spring-expression/src/main/java/org/springframework/expression/common/CompositeStringExpression.java

@@ -30,7 +30,7 @@ import org.springframework.expression.Expression;
  *
  * which will be represented as a CompositeStringExpression of two parts. The first part being a
  * LiteralExpression representing 'Hello ' and the second part being a real expression that will
- * call <code>getName()</code> when invoked.
+ * call {@code getName()} when invoked.
  *
  * @author Andy Clement
  * @author Juergen Hoeller

spring-expression/src/main/java/org/springframework/expression/spel/ast/OperatorInstanceof.java

@@ -25,7 +25,7 @@ import org.springframework.expression.spel.support.BooleanTypedValue;
 
 /**
  * The operator 'instanceof' checks if an object is of the class specified in the right hand operand,
- * in the same way that <code>instanceof</code> does in Java.
+ * in the same way that {@code instanceof} does in Java.
  *
  * @author Andy Clement
  * @since 3.0