Fix timespan example in EnvVar docs (#5520)

doc/EnvironmentVariables.md

@@ -14,10 +14,10 @@
 | LocalConfigPath                      | Path to local .json file containing Agent config                                                         | string                                        | .\config.json              |
 | MaxRestartCount                      | Max number of restarts allowed before a module is considered to have failed                              | int32                                         |                            |
 | MetricsEnabled         | Whether to enable metrics listener                                                                                                                 | bool                                                                  | true                          |
-| MetricsHistogramMaxAge | Time interval for the metrics histogram                                                                                                 | TimeSpan string        | 00:01:00 (1 hour)    
-| MetricScrapeInterval                 | Interval at which diagnostic metrics are sampled                                                         | TimeSpan string                               | 00:01:00 (1 hour)                 |
-| MetricUploadInterval                 | Interval at which diagnostic metrics are uploaded                                                        | TimeSpan string                               | 01:00:00 (1 day)                      |
-| PerformanceMetricsUpdateFrequency    | Interval to sample system performance metrics from host. These include CPU, RAM and Disk Space measurements.                                                            | TimeSpan string                               | 00:00:05 (5 minutes)                  |
+| MetricsHistogramMaxAge | Time interval for the metrics histogram                                                                                                 | [TimeSpan string](https://docs.microsoft.com/en-us/dotnet/api/system.timespan.parse?view=net-5.0#System_TimeSpan_Parse_System_String_)        | 01:00:00 (1 hour)    
+| MetricScrapeInterval                 | Interval at which diagnostic metrics are sampled                                                         | [TimeSpan string](https://docs.microsoft.com/en-us/dotnet/api/system.timespan.parse?view=net-5.0#System_TimeSpan_Parse_System_String_)                               | 01:00:00 (1 hour)                 |
+| MetricUploadInterval                 | Interval at which diagnostic metrics are uploaded                                                        | [TimeSpan string](https://docs.microsoft.com/en-us/dotnet/api/system.timespan.parse?view=net-5.0#System_TimeSpan_Parse_System_String_)                               | 1.00:00:00 (1 day)                      |
+| PerformanceMetricsUpdateFrequency    | Interval to sample system performance metrics from host. These include CPU, RAM and Disk Space measurements.                                                            | [TimeSpan string](https://docs.microsoft.com/en-us/dotnet/api/system.timespan.parse?view=net-5.0#System_TimeSpan_Parse_System_String_)                               | 00:05:00 (5 minutes)                  |
 | Mode                                 | specifies the mode for module deployment                                                                 | iotedged, docker, kubernetes                  | iotedged                   |
 | PersistentVolumeClaimDefaultSizeInMb | Size of the PersistedVolumeClaim, must be used with StorageClassName                                     | int32                                         |                            |
 | RequestTimeoutSecs                   | Timeout for handling ping and GetTaskStatus direct methods                                               | int32                                         | 600                        |