Remove utils from documentation as an exported module

[bronzdoc]

Description

Remove utils as an exported module since this is no longer true

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/adazzle/react-data-grid/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• [x ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x ] Other... Please describe:
Documentation changes

What is the current behavior? (You can also link to an open issue here)

What is the new behavior?

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[ x] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[bronzdoc]

Also... is there a way i can access methods from utils in >= 5.0.0 ? i was using the isEmptyArray in my code and i can't use it anymore.

Thanks for your time and help in advance!

[malonecj]

Hi, this is no longer public as of v5. However, we could add the utils as a separate npm package if there is a demand for this.