USER_GUIDE: fix require hyphen to underscore

[dla-c-box]

Description

There is a typo in the USER_GUIDE, require 'opensearch-aws-sigv4' gives the error LoadError: cannot load such file -- opensearch-aws-sigv4, because the file name has underscores, not hyphens.

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[nhtruong]

@dla-c-box but the gem name is opensearch-aws-sigv4 The end user will use the game, not the source code.

[dla-c-box]

Weird, I'm using bundler to install the gem from a cloned repo: gem "opensearch-aws-sigv4", git: "https://github.com/<clone in sync with here>/opensearch-ruby-aws-sigv4/", branch: "main"

And the require version with hyphens does not work even when executed through bundle exec, but this works with no problem: require 'opensearch_aws_sigv4'

[nhtruong]

You're right. But current users are using require 'opensearch-aws-sigv4. I got it working before. Lemme take look on what changed and look for a workaround.

[nhtruong]

@dla-c-box So the file name used to be opensearch-aws-sigv4.rb when I migrated this game to this repo. Then I implemented Rubocop, which complained about the filename using hyphens instead of underscore.

Would you mind renaming the file back to opensearch-aws-sigv4.rb and disable that Rubocop rule? Thanks.

[dblock]

Small note on Rubocop in general. I think we could just advise folks to run rubocop -a ; rubocop --auto-gen-config and not worry about it. 90% of the value is from auto-formatting.

[dla-c-box]

I deactivated the cop and renamed the file.

[dblock]

Before I merge, we could have both files, is that better? This way you can require file/gem the same.

Check out https://github.com/dblock/ruby-enum/tree/master/lib for an example.

[dla-c-box]

Done