add warning about devtools doctor error false positives

[kkemple]

when you run devtools doctor and your versions of docker binaries are higher than what is recommended you get an error response

this is misleading because running the tools works with higher versions, in fact, moving to lower versions caused issues with docker-compose

once docker-compose was restored to later version, it worked again, and devtools worked as expected

will open PR for devtools to change to warnings but it should be mentioned here