Docs: Clarify DestinationRule spec.trafficPolicy.connectionPool.tcp.maxConnections

[virtualdxs]

Bug description

The documentation for the DestinationRule field spec.trafficPolicy.connectionPool.tcp.maxConnections states the following:

Maximum number of HTTP1 /TCP connections to a destination host. Default 2^32-1.

This is misleading for two reasons:

1. It seems to imply that HTTP/2 connections are not subject to this limit, which per Envoy's docs doesn't seem to be the case
2. This is much more of a nitpick, but per Envoy's docs it's technically possible to surpass this limit, so it may be worth adding a caveat about that.

Affected product area (please put an X in all that apply)

[ ] Configuration Infrastructure
[X] Docs
[ ] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Policies and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience