Load Balancer cmdlets documentation update

[anavinahar]

Load Balancer documentation update -examples + description of few cmdlets

[azurecla]

Hi @anavinahar, I'm your friendly neighborhood Azure Pull Request Bot (You can call me AZPRBOT). Thanks for your contribution!

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[markcowl]

on demand run here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-demand/1080/