Documentation for amplitude_median in quality_metrics says "in absolute value"

[ecobost]

Docstring and documentation for amplitude_median says this is "median (in absolute value)"

spikeinterface/src/spikeinterface/metrics/quality/misc_metrics.py

Line 961 in f732780

"amplitude_median": "Median of the amplitude distributions (in absolute value) for each unit in uV."

It's definitely not

spikeinterface/src/spikeinterface/metrics/quality/misc_metrics.py

Line 951 in f732780

all_amplitude_medians[unit_id] = np.median(amplitudes_by_units[unit_id])

Maybe fix the docstring.

I actually like it to not be in absolute value cause if you have positive and negative spiking units, this is a proxy to see which are which. I would rather that information is kept here, if needed one can always take abs(df['amplitude_median'[) later.