Add Filtered Ephys Reference

[lawrence-mbf]

Related to #532

Motivation

Match listed FilteredEphys reference in PyNWB documentation

How to test the behavior?

Check HTML ecephys.html tutorial

Checklist

• [x] Have you ensured the PR description clearly describes the problem and solutions?
• [x] Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• [x] If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov[bot]]

Codecov Report

Merging #539 (f27db70) into master (7c446cb) will increase coverage by 0.01%. The diff coverage is 96.10%.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   87.77%   87.78%   +0.01%     
==========================================
  Files         132      132              
  Lines        5621     5626       +5     
==========================================
+ Hits         4934     4939       +5     
  Misses        687      687              

Files Changed	Coverage Δ
+types/+util/+dynamictable/addRawData.m	95.37% <95.37%> (+0.17%)	:arrow_up:
+types/+util/+dynamictable/addVarargRow.m	97.61% <97.61%> (ø)
+types/+util/+dynamictable/addRow.m	100.00% <100.00%> (ø)
+types/+util/+dynamictable/checkConfig.m	92.85% <100.00%> (+0.06%)	:arrow_up:

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