bug: Azure subscription color classes is bugging

[benm-stm]

when defining colors for the different subscription based on patterns, the latter one is loosing the name context
Also the documentation doesn't mention azure as supported in this feature

typeset -g POWERLEVEL9K_AZURE_CLASSES=(
      '*prod*'  PROD
      '*test*'  TEST           
      '*'       DEFAULT)

typeset -g POWERLEVEL9K_AZURE_DEFAULT_FOREGROUND=32
typeset -g POWERLEVEL9K_AZURE_TEST_FOREGROUND=green
typeset -g POWERLEVEL9K_AZURE_PROD_FOREGROUND=red

Also the documentation for azure is not found

[romkatv]

Fixed by #2379