pw_bluetooth_sapphire: Disambiguate comment

Improve comments for OnLEReadBufferSize* methods to clarify
which version of the command is supported by each.

Test: Builds
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/983313
GitOrigin-RevId: cef1abd866923b5a012d242cac0c709e13bc1b08
Change-Id: Iaed115b2de5de450c567481b40166390d524cfc9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/214673
Reviewed-by: Lulu Wang <[email protected]>
Lint: Lint 🤖 <[email protected]>
Pigweed-Auto-Submit: Jason Graffius <[email protected]>
Commit-Queue: Auto-Submit <[email protected]>
Reviewed-by: Faraaz Sareshwala <[email protected]>
Reviewed-by: Ben Lawson <[email protected]>

pw_bluetooth_sapphire/public/pw_bluetooth_sapphire/internal/host/testing/fake_controller.h

@@ -641,10 +641,10 @@ class FakeController final : public ControllerTestDoubleBase,
  void OnLESetEventMask(
  const pw::bluetooth::emboss::LESetEventMaskCommandView& params);
 
- // Called when a HCI_LE_Read_Buffer_Size command is received.
+ // Called when a HCI_LE_Read_Buffer_Size [v1] command is received.
  void OnLEReadBufferSizeV1();
 
- // Called when a HCI_LE_Read_Buffer_Size command is received.
+ // Called when a HCI_LE_Read_Buffer_Size [v2] command is received.
  void OnLEReadBufferSizeV2();
 
  // Called when a HCI_LE_Read_Supported_States command is received.