schemas: Descriptions must be strings

```
$ python3 -c 'import json; import jsonschema; schema = json.load(open("schemas/global.json")); cls = jsonschema.validators.validator_for(schema); cls.check_schema(schema)'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/jsonschema/validators.py", line 204, in check_schema
    raise exceptions.SchemaError.create_from(error)
jsonschema.exceptions.SchemaError: ['The schema for an entity manager configuration file.  An entity ', 'mananger configuration file can consist of a single object, or an ', 'array of objects.  Objects must be of type EMConfig.'] is not of type 'string'

Failed validating 'type' in metaschema['properties']['description']:
    {'type': 'string'}

On schema['description']:
    ['The schema for an entity manager configuration file.  An entity ',
     'mananger configuration file can consist of a single object, or an ',
     'array of objects.  Objects must be of type EMConfig.']
```

Change-Id: I2b8102e7d6047c8a7e624e182465065268fb8ad9
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/schemas/virtual_sensor.json b/schemas/virtual_sensor.json
index 77c39c9..512ea85 100644
--- a/schemas/virtual_sensor.json
+++ b/schemas/virtual_sensor.json
@@ -3,62 +3,46 @@
     "definitions": {
         "VirtualSensor": {
             "title": "phosphor-virtual-sensor configuration",
-            "description": [
-                "The configuration used by the virtual-sensor daemon",
-                "in the phosphor-virtual-sensor repository. Virtual",
-                "sensors are xyz.openbmc_project.Sensor.Value D-Bus",
-                "objects that have sensor values calculated from the",
-                "D-Bus sensors listed here."
-            ],
+            "description": "The configuration used by the virtual-sensor daemon in the phosphor-virtual-sensor repository. Virtual sensors are xyz.openbmc_project.Sensor.Value D-Bus objects that have sensor values calculated from the D-Bus sensors listed here.",
             "type": "object",
             "properties": {
                 "MaxValidInput": {
-                    "description": ["Maximum valid value of an input sensor"],
+                    "description": "Maximum valid value of an input sensor",
                     "type": "number"
                 },
                 "MaxValue": {
-                    "description": ["Maximum sensor value"],
+                    "description": "Maximum sensor value",
                     "$ref": "legacy.json#/definitions/Types/MaxValue"
                 },
                 "MinValidInput": {
-                    "description": ["Miniumum valid value of an input sensor"],
+                    "description": "Miniumum valid value of an input sensor",
                     "type": "number"
                 },
                 "MinValue": {
-                    "description": ["Minimum sensor value"],
+                    "description": "Minimum sensor value",
                     "$ref": "legacy.json#/definitions/Types/MinValue"
                 },
                 "Name": {
                     "type": "string"
                 },
                 "Sensors": {
-                    "description": [
-                        "Any DBus sensors whose values are used to",
-                        "determine the value of the virtual sensor."
-                    ],
+                    "description": "Any DBus sensors whose values are used to determine the value of the virtual sensor.",
                     "items": {
                         "type": "string"
                     },
                     "type": "array"
                 },
                 "Thresholds": {
-                    "description": [
-                        "Threshold values used to set and clear alarms"
-                    ],
+                    "description": "Threshold values used to set and clear alarms",
                     "$ref": "legacy.json#/definitions/Types/Thresholds"
                 },
                 "Type": {
-                    "description": [
-                        "The type of calculation this sensor uses."
-                    ],
+                    "description": "The type of calculation this sensor uses.",
                     "type": "string",
                     "enum": ["ModifiedMedian", "Maximum"]
                 },
                 "Units": {
-                    "description": [
-                        "The sensor type, as it shows up in the D-Bus",
-                        "object name."
-                    ],
+                    "description": "The sensor type, as it shows up in the D-Bus object name.",
                     "$ref": "legacy.json#/definitions/Types/Units"
                 }
             },