Docs: Fix missing await in programatic API

[zekenie]

Description

I'm working off this example and realized that loadDocuments returns a promise, so the example should probably use await

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

Adding links to sandbox or providing screenshots can help us understand more about this PR and take action on it as
appropriate

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also
list any relevant details for your test configuration

• Test A
• Test B

Test Environment:

• OS:
• @graphql-inspector/...:
• NodeJS:

Checklist:

• I have followed the CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you
did and what alternatives you considered, etc...

[zekenie]

@saihaj, I don't have merge access, do you know who does? I'm just trying to get this little thing off my PR list in github lol