standardize commands help wording and conventions

[jfatta]

• Minor changes to be on the same page regarding commands order, working, capitalization, punctuation, etc.
• Also applies to subcommands this time

go run ./cmd/auth0
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Usage:
  auth0 <resource> <operation> [parameters...]

Available Resources:
  login          Authenticate the Auth0 CLI
  clients        Manage resources for clients
  apis           Manage resources for APIs
  try-login      Try out your universal login box
  logs           Show the tenant logs
  rules          Manage rules for clients
  actions        Manage resources for actions
  connections    Manage resources for connections
  roles          Manage resources for roles
  custom-domains Manage resources for custom-domains
  completion     Setup autocomplete features for this CLI on your terminal

Flags:
      --force           Skip confirmation.
      --format string   Command output format. Options: json.
  -h, --help            help for auth0
      --no-input        Disable interactivity.
      --tenant string   Specific tenant to use. (default "jorgehack21")
      --verbose         Enable verbose mode.

Use "auth0 [command] --help" for more information about a command.