Currently, LSST documents generated from LaTeX source use a template that has a "document type" parameter. This parameter has documented values of "DM", "MN", and "CP" at this time, and a commonly-used but undocumented value of "SE" as well (for LSE- and LPM- documents).
As the documentation at https://lsst-texmf.lsst.io/lsstdoc.html says:
DM defines the document type to be a “Data Management” document. Other options include MN for minutes and CP for conference proceedings but these are holdovers from the original Gaia class file and currently have no effect on the document output. They are considered optional, but descriptive, at this time.
I suggest that we either add "SE" to the list above or, recognizing that the document type is in fact unused in the LaTeX template (it relies on the DocuShare handle, instead), remove the mention of the document type from the lsst-texmf documentation and, opportunistically, remove the document types from existing documents when other editing actions occur.