Incorrect documentation for --priority prameter

This page incorrectly states for the `--priority` parameter:

> Priority of the request routing rule. Range from 1 to **2000**.

The correct range is 1 to 20000. See this page for confirmation: https://docs.microsoft.com/en-us/azure/application-gateway/multiple-site-overview#request-routing-rules-evaluation-order

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#### Document Details

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* ID: 7d6ba93c-4a1c-c69d-f52a-001791e0220a
* Version Independent ID: 2dd75bbb-a92c-c8f5-354b-6d40e531190b
* Content: [az network application-gateway rule](https://docs.microsoft.com/en-us/cli/azure/network/application-gateway/rule?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/network/application-gateway/rule.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/latest/docs-ref-autogen/network/application-gateway/rule.yml)
* Service: **virtual-network**
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**