Update documentation of the create-account command

The documentation states that the command is used for creating
user accounts for batch/role access.  However this is not always
the case; it is possible to create an account for a real person
with an email address and name.

Update the documentation to say that if the account is created
without an email address, it may only be used for batch/role
access.

Change-Id: I213708e32f98585632810023afd9eca3e6f3df8e
1 file changed