Fix help command strings

[rachfop]

The RunPod CLI tool to manage resources on runpod.io and develop serverless applications.

Usage:
  runpodctl [command]

Aliases:
  runpodctl, runpod

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  config      Manage CLI configuration
  create      create a resource
  exec        Execute commands in a pod
  get         get resource
  help        Help about any command
  project     Manage RunPod projects
  receive     receive file(s), or folder
  remove      remove a resource
  send        send file(s), or folder
  ssh         SSH keys and commands
  start       start a resource
  stop        stop a resource
  update      update runpodctl

Flags:
  -h, --help      help for runpodctl
  -v, --version   Print the version of runpodctl

Some start with caps others do not. Should be consistent.
Also dont use (s):

Don't put optional plurals in parentheses. Instead, use either plural or singular constructions and keep things consistent throughout your documentation. Choose what is most appropriate for your documentation and your audience. If it's important in a specific context to indicate both, use one or more.

https://developers.google.com/style/plurals-parentheses