Update dfsadmin command line help and HdfsQuotaAdminGuide

dfsadmin command line top-level help menu is not consistent with detailed help menu.

• -safemode missed options -wait and -forceExit
• -restoreFailedStorage options are not described consistently (true/false/check, or Set/Unset/Check?)
• -setSpaceQuota optionally takes a -storageType parameter, but it's not clear what are the available options. (Seems to be (SSD, DISK, ARCHIVE), from HdfsQuotaAdminGuide.html)
• -reconfig seems to also take namenode as parameter