acl options should be hyphenated not underscored

[tfaieta]

Hey thanks for everything you all do with fastlane, really love the project 😄 🍾 . Noticed one small issue in the documentation for the acl option:

fastlane-plugin-s3/lib/fastlane/plugin/aws_s3/actions/aws_s3_action.rb

Line 768 in 0a28ed2

description: "Uploaded object permissions e.g public_read (default), private, public_read_write, authenticated_read ",

I believe the correct options are hyphenated public-read (like the default is), public-read-write, and authenticated-read instead of the underscored documented above.

AWS docs: https://docs.aws.amazon.com/cli/latest/reference/s3api/put-object.html#options