Add explanation for parameter $CALICO_VERSION

[kkbruce]

Reason for PR:

The $CALICO_VERSION parameter does not refer to the same version value in the context, which can cause errors after the script runs. Add an explanation to avoid errors.

Issue Fixed:

Issue #310

Requirements

• Sqaush commits
• Documentation
• Tests

Notes:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: kkbruce / name: Bruce Chen (66d6578)

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[kkbruce]

Thank you for your review. Your meaning is more precise than what I expressed.

[jsturtevant]

Thank you for taking the time to improve the docs!

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsturtevant, kkbruce

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