docs(ephys): correct JSON metadata filename convention

Update microelectrode electrophysiology documentation to use the
correct file suffixes `*_ecephys.json` or `*_icephys.json` instead
of the generic `*_ephys.json` to match the actual naming convention
for extracellular and intracellular electrophysiology metadata files.

Author: bendichter

src/modality-specific-files/microelectrode-electrophysiology.md

@@ -114,7 +114,7 @@ We propose to store all metadata that is not directly related to one of the othe
 
 There should be one such JSON file for each data file.
 
-The `*_ephys.json` file can be used to store any microephys-specific metadata for the dataset. We recommend storing all setup-related metadata in a dedicated node of the JSON file called `Setup`.
+The `*_ecephys.json` or `*_icephys.json` file can be used to store any microephys-specific metadata for the dataset. We recommend storing all setup-related metadata in a dedicated node of the JSON file called `Setup`.
 We recommend using the following keys to describe the setup:
 
 ### Institution Information