Polishing javadocs: IllegalStateException no longer thrown

The dependency to Apache Commons has been removed in 51252ebbca (diff-95dc9d8756aa91afb2ac28454f1b634c), but the javadoc still mentions it.

spring-core/src/main/java/org/springframework/util/Base64Utils.java

@@ -39,8 +39,6 @@ public abstract class Base64Utils {
 	 * Base64-encode the given byte array.
 	 * @param src the original byte array
 	 * @return the encoded byte array
-	 * @throws IllegalStateException if Base64 encoding between byte arrays is not
-	 * supported, i.e. neither Java 8 nor Apache Commons Codec is present at runtime
 	 */
 	public static byte[] encode(byte[] src) {
 		if (src.length == 0) {
@@ -53,8 +51,6 @@ public abstract class Base64Utils {
 	 * Base64-decode the given byte array.
 	 * @param src the encoded byte array
 	 * @return the original byte array
-	 * @throws IllegalStateException if Base64 encoding between byte arrays is not
-	 * supported, i.e. neither Java 8 nor Apache Commons Codec is present at runtime
 	 */
 	public static byte[] decode(byte[] src) {
 		if (src.length == 0) {
@@ -68,8 +64,6 @@ public abstract class Base64Utils {
 	 * "URL and Filename Safe Alphabet".
 	 * @param src the original byte array
 	 * @return the encoded byte array
-	 * @throws IllegalStateException if Base64 encoding between byte arrays is not
-	 * supported, i.e. neither Java 8 nor Apache Commons Codec is present at runtime
 	 * @since 4.2.4
 	 */
 	public static byte[] encodeUrlSafe(byte[] src) {
@@ -84,8 +78,6 @@ public abstract class Base64Utils {
 	 * "URL and Filename Safe Alphabet".
 	 * @param src the encoded byte array
 	 * @return the original byte array
-	 * @throws IllegalStateException if Base64 encoding between byte arrays is not
-	 * supported, i.e. neither Java 8 nor Apache Commons Codec is present at runtime
 	 * @since 4.2.4
 	 */
 	public static byte[] decodeUrlSafe(byte[] src) {
@@ -124,8 +116,6 @@ public abstract class Base64Utils {
 	 * "URL and Filename Safe Alphabet".
 	 * @param src the original byte array
 	 * @return the encoded byte array as a UTF-8 String
-	 * @throws IllegalStateException if Base64 encoding between byte arrays is not
-	 * supported, i.e. neither Java 8 nor Apache Commons Codec is present at runtime
 	 */
 	public static String encodeToUrlSafeString(byte[] src) {
 		return new String(encodeUrlSafe(src), DEFAULT_CHARSET);
@@ -136,8 +126,6 @@ public abstract class Base64Utils {
 	 * "URL and Filename Safe Alphabet".
 	 * @param src the encoded UTF-8 String
 	 * @return the original byte array
-	 * @throws IllegalStateException if Base64 encoding between byte arrays is not
-	 * supported, i.e. neither Java 8 nor Apache Commons Codec is present at runtime
 	 */
 	public static byte[] decodeFromUrlSafeString(String src) {
 		return decodeUrlSafe(src.getBytes(DEFAULT_CHARSET));