Update the help descriptions for commands #3484

Job	Run time
Build (ubuntu-latest, linux)	2m 10s
Build (windows-latest, windows)	7m 1s
Build (macos-latest, macos)	3m 48s
Docker Lint	24s
Acceptance Tests (ubuntu-latest, linux)	1m 24s
[k3s] demo-helmfile	40s
Acceptance Tests (windows-latest, windows)	6m 35s
[lint] demo-context	7s
[localstack] demo-localstack	2m 21s
Acceptance Tests (macos-latest, macos)	1m 41s
[lint] quick-start-advanced	7s
[mock-linux] examples/demo-atlantis	5s
[validate] demo-context	4s
[mock-linux] examples/demo-component-versions	9s
[validate] demo-localstack	6s
[validate] demo-stacks	3s
[validate] demo-helmfile	4s
[mock-linux] examples/demo-context	8s
[validate] quick-start-advanced	4s
[validate] quick-start-simple	5s
[mock-linux] examples/demo-vendoring	16s
[mock-linux] tests/fixtures/scenarios/complete	19s
[mock-windows] examples/demo-atlantis	21s
[mock-windows] examples/demo-component-versions	31s
[mock-windows] examples/demo-context	22s
[mock-windows] examples/demo-vendoring	1m 13s
[mock-windows] tests/fixtures/scenarios/complete	51s
[mock-macos] examples/demo-atlantis	11s
[mock-macos] examples/demo-component-versions	15s
[mock-macos] examples/demo-context	16s
[mock-macos] examples/demo-vendoring	24s
[mock-macos] tests/fixtures/scenarios/complete	31s
release	0s
	32m 36s

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