Fix javadoc warnings

Before this change there were numerous javadoc warnings being reported
while building Spring framework API.

This commit resolves most of the javadoc warnings, reducing the total
number from 265 to 103.

Issue: SPR-9113

spring-expression/src/main/java/org/springframework/expression/spel/SpelNode.java

@@ -43,7 +43,7 @@ public interface SpelNode {
 
 	/**
 	 * Determine if this expression node will support a setValue() call.
-	 * 
+	 *
 	 * @param expressionState the current expression state (includes the context)
 	 * @return true if the expression node will allow setValue()
 	 * @throws EvaluationException if something went wrong trying to determine if the node supports writing
@@ -77,7 +77,7 @@ public interface SpelNode {
 
 	/**
 	 * Determine the class of the object passed in, unless it is already a class object.
-	 * @param o the object that the caller wants the class of
+	 * @param obj the object that the caller wants the class of
 	 * @return the class of the object if it is not already a class object, or null if the object is null
 	 */
 	Class<?> getObjectClass(Object obj);