Changed 'heartbeat' in policy json file to 'monitoring network packets' and tweaked descriptions.

components/policy/resources/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 4841 matching lines @@
       'name': 'HeartbeatEnabled',
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome_os:43-'],
       'device_only': True,
       'features': {
         'dynamic_refresh': True,
       },
       'example_value': False,
       'id': 293,
-      'caption': '''Send monitoring heartbeats to the management server''',
+      'caption': '''Send network packets to the management server to monitor online status''',
       'tags': ['admin-sharing'],
-      'desc': '''Send monitoring heartbeats to the management server, to allow
+      'desc': '''Send network packets to the management server to monitor online status, to allow
       the server to detect if the device is offline.
 
-      If this policy is set to true, monitoring heartbeats will be sent. If set
-      to false or unset, then no heartbeats will be sent.''',
+      If this policy is set to true, monitoring network packets (so-called <ph name="HEARTBEATS_TERM">heartbeats</ph>) will be sent.
+      If set to false or unset, then no packets will be sent.''',

[Thiemo Nagel, 2016/07/11 14:33:21]

Nit: I think "then" may be dropped here.

     },
     {
       'name': 'HeartbeatFrequency',
       'type': 'int',
       'schema': { 'type': 'integer', 'minimum': 30000 },
       'supported_on': ['chrome_os:43-'],
       'device_only': True,
       'features': {
         'dynamic_refresh': True,
       },
       'example_value': 180000,
       'id': 294,
-      'caption': '''Frequency of monitoring heartbeats''',
+      'caption': '''Frequency of monitoring network packets''',
       'tags': [],
-      'desc': '''How frequently monitoring heartbeats are sent, in milliseconds.
+      'desc': '''How frequently monitoring network packets are sent, in milliseconds.
 
       If this policy is unset, the default frequency is 3 minutes. The minimum
       frequency is 30 seconds and the maximum frequency is 24 hours - values
       outside of this range will be clamped to this range.''',
     },
     {
       'name': 'LogUploadEnabled',
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome_os:46-'],
@@ skipping 3971 matching lines @@
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }