Update non-cluster hosts installation guide

[hjiawei]

This changeset updates the non-cluster installation guide for Calico Enterprise v3.20 EP2 release.

Product Version(s):
Calico Enterprise v3.20 EP2.

Issue:

Link to docs preview:

SME review:

• An SME has approved this change.

DOCS review:

• A member of the docs team has approved this change.

Additional information:

Merge checklist:

• Deploy preview inspected wherever changes were made
• Build completed successfully
• Test have passed

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[hjiawei]

This is a placeholder version format for RPM packages. We need to confirm the final version numbers from our release team.

[ctauchen]

Merged with #1760