Change tabs to spaces in nomad monitor help text

[angrycub]

The nomad monitor help has a formatting issue because of tabs in the string which should be spaces.

Before:

Usage: nomad monitor [options]

	Stream log messages of a nomad agent. The monitor command lets you
	listen for log levels that may be filtered out of the Nomad agent. For
	example your agent may only be logging at INFO level, but with the monitor
	command you can set -log-level DEBUG

General Options:

	-address=<addr>
    The address of the Nomad server.
    Overrides the NOMAD_ADDR environment variable if set.
    Default = http://127.0.0.1:4646

After:

Usage: nomad monitor [options]

  Stream log messages of a nomad agent. The monitor command lets you
  listen for log levels that may be filtered out of the Nomad agent. For
  example your agent may only be logging at INFO level, but with the monitor
  command you can set -log-level DEBUG

General Options:

  -address=<addr>
    The address of the Nomad server.
    Overrides the NOMAD_ADDR environment variable if set.
    Default = http://127.0.0.1:4646

[github-actions]

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