docs(providers-list): README incorrectly says resource includes company names

[cyanheads]

README.md (line 132) describes the fcc-broadband://providers/list resource as:

List of all Form 477 holding companies with `hoconum` identifiers and names.

But the resource returns only `hoconum` numbers — names are explicitly excluded. The actual resource description (in code and in `resources/list` output) correctly states: "Names are not included — use `fcc_search_providers` to resolve a company name to its hoconum."

Steps to reproduce

1. Read README.md resource table entry for `fcc-broadband://providers/list`
2. Call the resource — response contains only `{ hoconum }` objects, no company names

Actual behavior

Resource returns `[{ hoconum: "130002" }, ...]\ ` — no names.

Expected behavior

README should read: "List of all Form 477 holding company numbers (`hoconum` identifiers only). Use `fcc_search_providers` to resolve a name to its hoconum."

Fix

Update README.md resource table description to remove "and names" and note the name-lookup flow.