add EventDetection and FeatureExtraction code to ecephys tutorial

[bendichter]

Motivation

I realized that there was no code demonstrating how to use EventDetection, so I added a small snippet. I also consolidated some of the information from another paragraph

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.04%. Comparing base (8559eb2) to head (f982b5b).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2002   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files          27       27           
  Lines        2704     2704           
  Branches      705      705           
=======================================
  Hits         2489     2489           
  Misses        141      141           
  Partials       74       74           

Flag	Coverage Δ
integration	72.92% <ø> (ø)
unit	82.98% <ø> (ø)

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