update docs to reflect multiselect behavior of select

[dave-connors-3]

          Since `select` now allows multiple arguments, we cannot have `--select` before the `project_name` argument.

(dbt-meshify-py3.11) > $ poetry run dbt-meshify split --select "+orders" revenue                                                                                                                                         
Usage: dbt-meshify split [OPTIONS] PROJECT_NAME
Try 'dbt-meshify split --help' for help.

Error: Missing argument 'PROJECT_NAME'.

Instead, we need to order arguments/options specifically

(dbt-meshify-py3.11) > $ poetry run dbt-meshify split revenue --select "+orders"                                                                                                                                   

I don't this is a blocker per se. At the very least, documentation should be refined in a follow-up.

Originally posted by @nicholasyager in #63 (comment)