Fix incorrect API version in NetworkWatcher's examples

[anton-evseev]

Latest improvements:

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[openapi-sdkautomation]

SDK Automation [Logs] (Generated from 011b591, Iteration 1)

Python: Azure/azure-sdk-for-python [Logs] [Diff]

• No packages generated.

Java: Azure/azure-sdk-for-java [Logs] [Diff]

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• network/mgmt/2015-06-15 [Logs]
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• preview/network/mgmt/2015-05-01-preview [Logs]

JavaScript: Azure/azure-sdk-for-js [Logs] [Diff]

• @azure/arm-network [Logs] [Instructions] [Generation PR] [Integration PR]
  • azure-arm-network-14.0.0.tgz

Ruby: Azure/azure-sdk-for-ruby [Logs] [Diff]

• azure_sdk [Logs] [Instructions]
  • azure_sdk-0.19.7.gem

[AutorestCI]

Automation for azure-sdk-for-go

Unable to detect any generation context from this PR.

[AutorestCI]

Automation for azure-sdk-for-python

Unable to detect any generation context from this PR.

[azuresdkci]

Can one of the admins verify this patch?