Pass through pla-150 to drop comments that just describe what the next
line already does:
- whatsapp_calls_controller: removed the Twilio-comparison note (the
ensure_calling_enabled body says it), the SDP-forwarding tagline, and
tightened the 138006/transport-error/wamid blocks.
- call.rb: dropped trivial annotations on STATUSES / TERMINAL_STATUSES;
the names already say what they are.
- send_on_channel_service: collapsed the two-line voice_call rationale
into one — the surrounding context covers the rest.
No behavior change. 33/33 enterprise call specs still pass; rubocop clean.
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