Add clarifications to dev env versions in doc
Add clarifications to dev env versions in doc

Update Go version and add caveats to dev env version doc.

Signed-off-by: David Enyeart <3d699cfec69cc11a9ba1c3a1aef3260ab163489b@us.ibm.com>

manish-sethi/fabric,hyperledger/fabric,jimthematrix/fabric,manish-sethi/fabric,jimthematrix/fabric,hyperledger/fabric