A few small random changes

Fix description in printed text in set_orin_clock.sh

Put a print statement in image_logger that alerts to not starting logging
until the joystick enabled is pressed

Added more info about format of channel required to use viewer for
orins that have multiple cameras attached

Change-Id: Ieef69e88e9524bceb0f95525643880d6329b67ab
Signed-off-by: Jim Ostrowski <yimmy13@gmail.com>
diff --git a/y2024/vision/viewer.cc b/y2024/vision/viewer.cc
index c72c08e..c741445 100644
--- a/y2024/vision/viewer.cc
+++ b/y2024/vision/viewer.cc
@@ -86,7 +86,9 @@
 
   frc971::constants::ConstantsFetcher<y2024::Constants> constants_fetcher(
       &event_loop);
-  CHECK(absl::GetFlag(FLAGS_channel).length() == 8);
+  CHECK(absl::GetFlag(FLAGS_channel).length() == 8)
+      << " channel should be of the form '/cameraN' for viewing images from "
+         "camera N";
   int camera_id = std::stoi(absl::GetFlag(FLAGS_channel).substr(7, 1));
   const auto *calibration_data = FindCameraCalibration(
       constants_fetcher.constants(), event_loop.node()->name()->string_view(),