Consistent Approach to Referring to Tekton Resources Through CLI

[danielhelfand]

As documented in tektoncd/cli#605, it would be nice if the hub cli followed a similar approach for referring to Tekton resources in docs/user facing messages. To address this for hub, I believe all that would need to happen is to update the usage for commands:

Capitalize pipeline/task under Available commands for hub get -h:

Get resource manifest by its name, kind, catalog, and version

Usage:
tkn hub get [flags]
  tkn hub get [command]

Available Commands:
  pipeline    Get Pipeline by name, catalog and version
  task        Get Task by name, catalog and version

Flags:
      --from string      Name of Catalog to which resource belongs to. (default "tekton")
  -h, --help             help for get
      --version string   Version of Resource

Global Flags:
      --api-server string   Hub API Server URL (default "https://api.hub.tekton.dev")

Use "tkn hub get [command] --help" for more information about a command.

Capitalize pipeline/task under Available commands for hub get task -h and hub get pipeline -h for description/examples:

Task

Get Task by name, catalog and version

Usage:
tkn hub get task [flags]

Examples:
  
Get a Task of name 'foo':

    tkn hub get task foo

or

Get a Task of name 'foo' of version '0.3':

    tkn hub get task foo --version 0.3


Flags:
  -h, --help   help for task

Global Flags:
      --api-server string   Hub API Server URL (default "https://api.hub.tekton.dev")
      --from string         Name of Catalog to which resource belongs to. (default "tekton")
      --version string      Version of Resource

Pipeline

Get Pipeline by name, catalog and version

Usage:
tkn hub get pipeline [flags]

Examples:
  
Get a Pipeline of name 'foo':

    tkn hub get pipeline foo

or

Get a Pipeline of name 'foo' of version '0.3':

    tkn hub get pipeline foo --version 0.3


Flags:
  -h, --help   help for pipeline

Global Flags:
      --api-server string   Hub API Server URL (default "https://api.hub.tekton.dev")
      --from string         Name of Catalog to which resource belongs to. (default "tekton")
      --version string      Version of Resource

/kind cleanup