Fix AttachedRoutes documentation aligned to count only Accepted Routes

[davidesalerno]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR is fixing the documentation for the AttachedRoutes field specifying that counts only Accepted = true Routes

Which issue(s) this PR fixes:

Fixes #4321

Does this PR introduce a user-facing change?:

NONE

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[rikatz]

/cc @davidjumani @youngnick

one missing piece on the docs we have recently changed

/ok-to-test

[robscott]

Thanks @davidesalerno!

[robscott]

I haven't been following this as closely as I should, but maybe I can reword this to make sure I'm understanding it correctly:

1. AttachedRoutes should always be set on each Listener, even if the Listener itself has not been accepted
2. AttachedRoutes should only represent the number of Routes with the Accepted condition set to True that have been attached to this Listener

If so, I'm completely on board with point 2, but confused by point 1 (although I recognize that it's not new in this PR).

/cc @rikatz @youngnick