BETA: Fix response usecase doc

[vitorgamer58]

Fixes https://github.com/herbsjs/herbsshelf/issues/57

Proposed Changes

1. Fix push inside if(usecase.request)
2. Adds checker in ifs, because empty object is considered true by javascript
3. Checks if value is array before inserting into responseParams and adds logic to handle array

Readiness Checklist

Author/Contributor

• [ ] If documentation is needed for this change, has that been included in this pull request
• [ ] Remember to check if code coverage decrease, if so, please implement the necessary tests

Reviewing Maintainer

• [ ] Label as breaking if this is a large fundamental change
• [ ] Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (beta@f12f040). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head 80b392c differs from pull request most recent head d6c076b. Consider uploading reports for the commit d6c076b to get more accurate results

@@           Coverage Diff           @@
##             beta      #59   +/-   ##
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  Coverage        ?   86.31%           
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  Files           ?        9           
  Lines           ?       95           
  Branches        ?        0           
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  Hits            ?       82           
  Misses          ?       13           
  Partials        ?        0           

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[herbsjs-robot]

:tada: This PR is included in version 5.1.0-beta.6 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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