Update New-AzureRmStorageAccount.md

[maddieclayton]

Description

Fix issue where accountname cannot be uppercase.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate change log has been updated
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • the changes have gone through a cmdlet design review
  • the cmdlet markdown files were generated using the platyPS module

[blueww]

It's better to also change the help of other cmdlets get/Set/New/Update-AzureRmStorageAccount, to make they are aligned. But consider other cmdlets will use an exist account name (which should already be lower case), and this cmdlet will input a new account name, fix this cmdlet help will be more important.

[maddieclayton]

@blueww Thanks for pointing that out - I have updated all the help files in storage to use lower case syntax in StorageAccountName.

[blueww]

The storage cmdlets help change looks good to me. Someone else might need to review the test change.