Incorrect output directory flag in cbbackupmgr logs

Hi team,

Looks like there is a small typo in the backupmgr collect-info docs, where output_dir should be output-dir:

o,-output_dir <dir>
Specifies a path where the zip file that this command writes should be written. If this flag is not used then the zip file is written to the logs directory of the archive the command is run against.