fix: some bugs

[liu-hm19]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR fixes some bugs, including some typos and wrong hints of the cmd.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., design docs, usage docs, etc.:

[coveralls]

Pull Request Test Coverage Report for Build 8461736426

Details

• 4 of 13 (30.77%) changed or added relevant lines in 3 files are covered.
• 13 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.1%) to 58.03%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/engine/runtime/terraform/install.go	1	10	10.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/engine/runtime/terraform/install.go	3	20.69%
pkg/engine/operation/parser/spec_parser.go	4	56.1%
pkg/engine/operation/parser/parser.go	6	75.61%

Totals
Change from base Build 8451425947:	-0.1%
Covered Lines:	7360
Relevant Lines:	12683

---

💛 - Coveralls

[SparkYuan]

lgtm