Add missing : to if_version tags in KIC docs

[mheap]

Description

KIC 3.2 content was being rendered in the 3.1 docs.

cc @fabianrbz we should probably error out if gte: lte: or :eq can't be found in the if_version tag

Testing instructions

Preview link: /kubernetes-ingress-controller/3.1.x/guides/requests/rewrite-host-and-paths/#path-manipulation

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

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