Update ephys.md

[arnodelorme]

--- PLEASE READ AND DELETE THE TEXT BELOW BEFORE OPENING THE PULL REQUEST ---

See the CONTRIBUTING guide. Specifically:

• Please keep the title of your Pull Request (PR) short but informative - it will appear in the changelog.
• If you do not want a PR to appear in the changelog, it must receive the exclude-from-changelog label.
• Please ensure your name is credited on our Contributors appendix. To add your name, please edit our Contributors wiki and add your name with the type of contribution. For assistance, please tag @bids-standard/maintainers.
• Use one of the following prefixes in the title of your PR:
  • [ENH] - enhancement of the specification that adds a new feature or support for a new data type
  • [FIX] - fix of a typo or language clarification
  • [INFRA] - changes to the infrastructure automating the specification release (for example building HTML docs)
  • [SCHEMA] - changes to the BIDS schema and/or related code
  • [MISC] - everything else including changes to the file listing contributors
• If you are opening a PR to obtain early feedback, but the changes are not ready to be merged (also known as a "Work in Progress" PR), please use a Draft PR.
• After opening the PR, our continuous integration services will automatically check your contribution for formatting errors and render a preview of the BIDS specification with your changes. To see the checks and preview, scroll down and click on the show all checks link. From the list, select the Details link of the ci/circleci: build_docs artifact check to see the preview of the BIDS specification.
• If you are updating the schema and you need to subsequently make changes to the bidsschematools code (validation, tests, rendering), this means your PR probably introduces a compatibility breaking change and you should increment the minor version (the second number) in bids-specification/src/schema/SCHEMA_VERSION.

--- PLEASE READ AND DELETE THE TEXT ABOVE BEFORE OPENING THE PULL REQUEST ---

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a550cc5) 87.97% compared to head (9c76180) 87.97%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## bep021 #1681 +/- ## ======================================= Coverage 87.97% 87.97% ======================================= Files 16 16 Lines 1356 1356 ======================================= Hits 1193 1193 Misses 163 163 ```

:umbrella: View full report in Codecov by Sentry.
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