Update warning with detail about unstable data.

Author: psomhorst

eitprocessing/features/pixel_breath.py

@@ -228,7 +228,11 @@ def find_pixel_breaths(  # noqa: C901, PLR0912, PLR0915
                     if len(peak_distances) == 0:
                         # no peaks found, skip pixel
                         warnings.warn(
-                            f"Skipping pixel ({row}, {col}) because no cross correlation peak found.",
+                            (
+                                f"Skipping pixel ({row}, {col}) because no cross correlation peak found. "
+                                "This may be due to unstable (pixel) impedance. "
+                                "This algorithm does not handle unstable impedance data well."
+                            ),
                             RuntimeWarning,
                             stacklevel=2,
                         )