Updated onprem.md with grammar/style fixes.
Updated onprem.md with grammar/style fixes.

**One question** Regarding the following text in the ## Start Cloudbreak section:
"Cloudbreak should start within a minute - you should see a line like this: Started CloudbreakApplication in 36.823 seconds"

What does "Cloudbreak should start within a minute" mean in this sentence? 

Do you meant that "If Cloudbreak started within a minute, you will see a line like this: 'Started CloudbreakApplication in 36.823 seconds'. 

?
sequenceiq/cloudbreak-docs,sequenceiq/cloudbreak-docs