uses-rel-preconnect should specify the suggested limit of 2, or only show up to 2 options

[connorjclark]

Currently the audit will list many potential options for preconnect, and if the user does all, the next run will warn and say you should only have 2.

LH should be more preemptive, either by a simple change in the description, or possibly by only showing 2 items in the table.

The former is my preference, perhaps with additional information (if possible) on how the preconnect might impact fcp/lcp. Ideal a developer can determine which origins are most important for preconnect, but given no preference LH should provide more numbers (better than current "wastedMs") for them to make decision.

ref #9903, #11279

[connorjclark]

We're gonna just update the audit description and docs to caution against preconnecting too much.