Update Arlec PC191HA to include information about multiple modules

[BHoggs]

Brief description of the changes

It appears that Series 2 devices are a mixed bag of internals - added some information to help clarify which wifi module is actually inside a series 2 plug without the need to open it.

There is some discussion about the multiple modules here: https://community.home-assistant.io/t/kickstart-bk7231t-to-esphome-add-on/701658

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

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Lighthouse	1 paths audited Performance: 77 (🔴 down 16 from production) Accessibility: 86 (no change from production) Best Practices: 100 (no change from production) SEO: 89 (no change from production) PWA: 70 (no change from production) View the detailed breakdown and full score reports

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[jesserockz]

Much appreciated 🙏