fix(docs): clarify in the CLI help that argument values must be specified with `=`

[timrogers]

Details

Unlike many CLIs, the plasmo CLI requires argument values to be provided with = notation (e.g. --target=chrome-mv3).

This requirement comes from the getFlag method in the @plasmo/utils package.

https://github.com/PlasmoHQ/plasmo-utils/blob/2838ca6214117bfd93b566b4b75586f6a9bd89f7/flags.ts#L8-L16

This expectation isn't clear in the documentation in the CLI, which is quite misleading. This fixes that, updating all of the examples to clearly show setting a value with =.

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