fix(site/src): use the browser-only bullets from the copy doc - #28434

TL;DR: this paywall was listing the wrong reasons to buy Premium. Now it lists the right ones.

The Premium Copy Updates doc gained copy for the /deployment/security browser-only connections row after #28339 was written, so that paywall was still falling back to the generic PREMIUM_FEATURES list ("High availability & workspace proxies", "24x7 global support with SLA", etc.).

• Bullets now match the doc: "Restrict access to web-based connections", "Block SSH and port-forward entirely", "Enforce browser-only compliance policies".
• The description already matched the doc; it was a multi-line JSX string literal that embedded a newline and tabs, so it is now a single line.
• The section's "Read the docs" button already points at /admin/networking#browser-only-connections, which is the doc's Learn more URL. No change needed.

Proof

From a local dev deployment with no license. DOM assertions against the same page:

Restrict access to web-based connections -> 1
Block SSH and port-forward entirely      -> 1
Enforce browser-only compliance policies -> 1
24x7 global support with SLA             -> 0

pnpm exec tsc --noEmit, pnpm exec biome check src, and the page's Storybook tests pass.

Generated by Coder Agents on behalf of @david-fraley.