Update HV-VES documentation

Add information about ability to change HV-VES logging level from
command line

Change-Id: Iff1168b6a30be20ef3cf237b244585bafdc824a4
Issue-ID: DCAEGEN2-1045
Signed-off-by: Filip Krzywka <filip.krzywka@nokia.com>
diff --git a/docs/sections/services/ves-hv/deployment.rst b/docs/sections/services/ves-hv/deployment.rst
index 5552906..054523b 100644
--- a/docs/sections/services/ves-hv/deployment.rst
+++ b/docs/sections/services/ves-hv/deployment.rst
@@ -56,6 +56,10 @@
 +-----------------------+------------+----------------------------+----------+-----+-----------------+-------------------------------------------------------+
 | max-payload-size      | m          | VESHV_MAX_PAYLOAD_SIZE     | no       | yes | 1048576 (1 MiB) | Maximum supported payload size in bytes               |
 +-----------------------+------------+----------------------------+----------+-----+-----------------+-------------------------------------------------------+
+| log-level             | ll         | VESHV_LOG_LEVEL            | no       | yes | INFO            | Log level on which HV-VES publishes all log messages  |
+|                       |            |                            |          |     |                 | Valid argument values are (case insensitive): ERROR,  |
+|                       |            |                            |          |     |                 | WARN, INFO, DEBUG, TRACE.                             |
++-----------------------+------------+----------------------------+----------+-----+-----------------+-------------------------------------------------------+
 
 As part of experimental API if you do not specify `ssl-disable` flag, there is need to specify additional
 parameters for security configuration.