Javadoc: Use "file system" instead of "filesystem".

Gary Gregory · Gary Gregory · commit 41857bd10054 · 2019-05-30T13:54:31.000-04:00
diff --git a/src/main/java/org/apache/commons/io/monitor/FileAlterationObserver.java b/src/main/java/org/apache/commons/io/monitor/FileAlterationObserver.java
@@ -30,7 +30,7 @@
 
 /**
  * FileAlterationObserver represents the state of files below a root directory,
- * checking the filesystem and notifying listeners of create, change or
+ * checking the file system and notifying listeners of create, change or
  * delete events.
  * <p>
  * To use this implementation:
