Some of the opa cli flag descriptions don't match the online documentation

[OmegaVVeapon]

Expected Behavior

Running opa eval --help should show similar descriptions to the descriptions show for those same flags in https://www.openpolicyagent.org/docs/latest/#2-try-opa-eval

Actual Behavior

The opa cli shows:

-d, --data string                                   set data file(s) or directory path(s)

for the data flag.

The online docs show:

--data | -d | Load policy or data files into OPA. This flag can be repeated.

Notice how the CLI description makes no mention that the policy needs to be loaded as data.

This can be confusing to newcomers to OPA (like me).

Steps to Reproduce the Problem

Self-explanatory.

Additional Info

Submitting a PR for this in a few minutes...