docs(vanilla typescript): Fix the return type of the exec function

[Brookke]

Description

When working through the vanilla typescript example I found that the shape of the data actually returned by the fetch was result.data.allPeople rather than result.allPeople that the types suggests. This PR corrects that.

Related #10359

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)

Screenshots/Sandbox (if appropriate/relevant):

N/A

How Has This Been Tested?

N/A

Checklist:

• [x] I have followed the CONTRIBUTING doc and the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] 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...

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Latest commit: 35dc815c943bfd2b0024d69bbbb9bd8779b5e533

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