Uncomment toleration section in spaces HA docs

[cbuto]

Description

Uncomment some existing docs around setting tolerations on Spaces components

Type of change

• Bug fix (typo, broken link, incorrect info)
• Content update (new info, clarification, reorganization)
• New content (new page, section, or guide)

Checklist

• I ran make lint locally (or will fix Vale suggestions in review)
• Links work and point to the right places
• If this adds new content, I tested the examples/instructions

Additional notes

Regarding this ask from customer: https://linear.app/upbound/issue/SPA-397/add-nodeselectors-and-tolerations-for-vcluster-etcd

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