offlineimap.conf: Clarify password options via netrc
offlineimap.conf: Clarify password options via netrc

Document that only one user name per host name can be given via netrc
file.  Reformat the enumeration text.

Signed-off-by: Sebastian Spaeth <98dcb2717ddae152d5b359c6ea97e4fe34a29d4c@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <347709267ddd1958560c4c317ea3fd613f10a719@laposte.net>

frioux/offlineimap,frioux/offlineimap