Fixed typo in LogFileManagerTest

Signed-off-by: David Matějček <david.matejcek@omnifish.ee>

nucleus/glassfish-jul-extension/src/test/java/org/glassfish/main/jul/rotation/LogFileManagerTest.java

@@ -147,7 +147,7 @@ public void rolling() throws Exception {
                 break;
             }
             if (System.currentTimeMillis() > start + 5000) {
-                fail("Incorrect numbe of files, expected 5, but found these:\n" + toString(files));
+                fail("Incorrect number of files, expected 5, but found these:\n" + toString(files));
             }
             Thread.sleep(10);
         }