Remove use of '<' and '>' which cause javadoc errors

Tested with Java 8 and "mvn javadoc:test-javadoc".  Eliminates errors such as:

    [ERROR] java/hudson/os/DCOMSandbox.java:18: error: bad use of '>'

core/src/test/java/hudson/FilePathTest.java

@@ -342,7 +342,7 @@ public class FilePathTest {
     }
             
     /**
-     * Checks that big files (>8GB) can be archived and then unpacked.
+     * Checks that big files (greater than 8GB) can be archived and then unpacked.
      * This test is disabled by default due the impact on RAM.
      * The actual file size limit is 8589934591 bytes.
      * @throws Exception test failure