@stevenayers-bge 
I've just checked source code of delta and you're right - documentation states that tat minReaderVersion should be >=2, but source code is upgrading it to 3

https://github.com/delta-io/delta/blob/78970abd96dfc0278e21c04cda442bb05ccde4a1/spark/src/main/scala...

That's either a bug in a code or mistake in documentation. I'll raise an issue to delta on github.