fixing broken link
removed image reference and replaced with text directions at the request of the writer
Merge pull request #1537 from Jemash/master

sql-database premium broken link and broken image fix
Update sign-up-for-sql-database-premium.md
Update sign-up-for-sql-database-premium.md
Update sign-up-for-sql-database-premium.md
Update sign-up-for-sql-database-premium.md
Merge branch 'master' of https://github.com/WindowsAzure/azure-content into LocalMaster
Merge pull request #1546 from WindowsAzure/LocalMaster

From Public Repo
Merge branch 'master' of https://github.com/WindowsAzure/azure-content-pr into localMaster