Update system requirements for Edge and Opera browsers in documentation

[eatsjobs]

Fix Web SDK minimum browser support for v8.x

Summary

Updates the browser compatibility table for the Web SDK to accurately reflect the minimum supported versions introduced in SDK 8.0, where the minimum Chrome version was raised
to 85+.

Changes

Edge: 79+ → 85+ (both columns)
Edge is Chromium-based. Since Chrome 85+ is the new baseline for SDK 8.x, Edge was aligned accordingly. See Edge release
history.

Opera: 55+/44+ → 71+/71+ (both columns)
Opera desktop is Chromium-based. Opera 71 corresponds to Chromium 85, so both the
Threads and Single thread minimums were updated to match the Chrome 85+ baseline. The previous values (55/44) mapped to Chromium 68 and ~57 respectively, which predate the SDK
8.x baseline.

Opera Android: 63+/46+ → 80+/60+

• Threads: SharedArrayBuffer is only supported from Opera Android 80+, verified via caniuse. The previous value of 63+ was incorrect
  as it predates SAB support.
• Single thread: Updated to 60+, which aligns with the Chromium 85 baseline. The previous value of 46+ was stale from an older SDK baseline.