Incorrect caption for physical cores

[jwmoss]

Nearly 70% of users have machines with two physical cores.

Not sure if this is the right repository, but under cpu cores chart, it states the above. This should probably be updated to reflect recent data.

[janbrasna]

This was most recently updated in:

• Update text for Firefox Public Data Report ensemble-transposer#237

Since then admittedly 4core took over:

[janbrasna]

I've opened mozilla/ensemble-transposer#244 for similar updates, this one is perhaps the most visible. I've proposed some changes in mozilla/ensemble-transposer#245 — if you have any suggestions for wording I'd appreciate any feedback, thanks.