[Doc]: New-AzApplicationInsightsContinuousExport parameters

### Description

On this page https://docs.microsoft.com/en-us/powershell/module/az.applicationinsights/new-azapplicationinsightscontinuousexport?view=azps-6.6.0&viewFallbackFrom=azps-6.3.0

The example shows -StorageLocation sourcecentralus, the param description states:

-StorageLocation
Destination Storage Location Id.

Which doesn't really describe what information we need to pass the parameter. We're already passing it the storage account id, container, and resource group. Based on the example value I believe it wants the geolocation of the storage account but doesn't explain why the word source is in front of it.

I think the param description needs to be more detailed, at the moment it's very vague. Somewhat like looking up a word in a dictionary only to find that they used the same word on the definition.

Start with the linked New-AzApplicationInsightsContinuousExport documentation page and inspect the -StorageLocation example and parameter description. Clarify what value is expected, including the meaning of the sourcecentralus example and how it relates to the storage account details, then verify the rendered parameter documentation is specific and consistent.

Written by the indexing model from the issue text.