update reference file to include other schedule options #267
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Summary
Updates the reference material to include the valid options for triggers
Additional Context
Not all options are listed in the text, as per the examples starting on line 130. Also the current text does not match the code here and here.
Related Issues (if any)
If #266 is merged first, then further updates might be required.
Checklist
This is a small change to the documentation, no updates to the actual code. All changes have been made with a Markdown editor and kept with the style of the existing Markdown in the file.