Javadoc: Normalize and fix spelling

Author: garydgregory

src/main/java/org/apache/commons/io/input/Tailer.java

@@ -1043,7 +1043,7 @@ public void run() {
                      * - gets "touched"
                      * - Files.getLastModifiedTime returns a new timestamp but newer data is not yet there (
                      *   was reported to happen on busy systems or samba network shares, see IO-279)
-                     * The default behaviour is to replay the whole file. If this is unsdesired in your usecase,
+                     * The default behavior is to replay the whole file. If this is undesired in your usecase,
                      * use the ignoreTouch builder flag
                      */
                     if (!ignoreTouch) {