Update InputsCheckpoint.rst

docs/source/inputs/InputsCheckpoint.rst

@@ -15,4 +15,7 @@ The following inputs must be preceded by "amr" and control checkpoint/restart.
 +------------------+-----------------------------------------------------------------------+-------------+-----------+
 | check_file       | Prefix to use for checkpoint output                                   |  String     | chk       |
 +------------------+-----------------------------------------------------------------------+-------------+-----------+
-
+| check_walltime   | Write a check point file after the specified walltime (HH:MM:SS)      |  String     | None      |
+|                  | has lapsed. For example, if amr.check_waltime = 00:10:00, then a      |             |           |
+|                  | checkpoint file is after a job has run for ten minutes.               |             |           |
++------------------+-----------------------------------------------------------------------+-------------+-----------+