Document NumberUtils.parseNumber() trim behavior

Issue: SPR-9523

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

@@ -178,7 +178,8 @@ private static void raiseOverflowException(Number number, Class<?> targetClass)
 	/**
 	 * Parse the given {@code text} into a {@link Number} instance of the given
 	 * target class, using the corresponding {@code decode} / {@code valueOf} method.
-	 * <p>Trims the input {@code String} before attempting to parse the number.
+	 * <p>Trims all whitespace (leading, trailing, and in between characters) from
+	 * the input {@code String} before attempting to parse the number.
 	 * <p>Supports numbers in hex format (with leading "0x", "0X", or "#") as well.
 	 * @param text the text to convert
 	 * @param targetClass the target class to parse into