Session name in `Primary data convention` datetime is not consistent with examples

[bruno-f-cruz]

The session name states:

Format <acquisition-start-datetime>: yyyymmdd_HH-MM-SS

This seems at odds with all the examples in the rest of the document:

📦655568_2022-04-26_11-48-09

If we are changing the convention can we please adopt something standard that allows iso-ish parsing as documented here: https://github.com/AllenNeuralDynamics/aind-file-standards/blob/main/docs/core/core-standards.md

[dbirman]

If we are changing the convention can we please adopt something standard that allows iso-ish parsing as documented here: https://github.com/AllenNeuralDynamics/aind-file-standards/blob/main/docs/core/core-standards.md

The convention wasn't changed. It will change for aind-data-schema v3.