Fix typo in StringUtils class

Closes gh-24471

spring-core/src/main/java/org/springframework/util/StringUtils.java

@@ -79,7 +79,7 @@ public abstract class StringUtils {
 
 	/**
 	 * Check whether the given object (possibly a {@code String}) is empty.
-	 * This is effectly a shortcut for {@code !hasLength(String)}.
+	 * This is effectively a shortcut for {@code !hasLength(String)}.
 	 * <p>This method accepts any Object as an argument, comparing it to
 	 * {@code null} and the empty String. As a consequence, this method
 	 * will never return {@code true} for a non-null non-String object.