Chore: Updated documentation for Fx/Fy units. (#2314)

https://mrcal.secretsauce.net/lensmodels.html

Updated the labeling for camera calibration results with MRCAL.

docs/source/docs/calibration/calibration.md

@@ -83,7 +83,7 @@ Details about a particular calibration can be viewed by clicking on that resolut
 More info on what these parameters mean can be found in [OpenCV's docs](https://docs.opencv.org/4.8.0/d4/d94/tutorial_camera_calibration.html)
 :::
 
-- Fx/Fy: Estimated camera focal length, in mm
+- Fx/Fy: Estimated camera focal length, in pixels
 - Fx/Cy: Estimated camera optical center, in pixels. This should be at about the center of the image
 - Distortion: OpenCV camera model distortion coefficients
 - FOV: calculated using estimated focal length and image size. Useful for gut-checking calibration results

photon-client/src/components/cameras/CameraCalibrationInfoCard.vue

@@ -187,7 +187,7 @@ const viewingImg = ref(0);
                           .getCalibrationCoeffs(props.videoFormat.resolution)
                           ?.cameraIntrinsics.data[0].toFixed(2) || 0.0
                       }}
-                      mm
+                      px
                     </td>
                   </tr>
                   <tr>
@@ -198,7 +198,7 @@ const viewingImg = ref(0);
                           .getCalibrationCoeffs(props.videoFormat.resolution)
                           ?.cameraIntrinsics.data[4].toFixed(2) || 0.0
                       }}
-                      mm
+                      px
                     </td>
                   </tr>
                   <tr>