docs: fix extra closing parenthesis

[MAKIO135]

Description of Change

There was an extra closing parenthesis in the example of creating a menu dynamically in a web page https://electronjs.org/docs/api/menu#render-process

Checklist

• relevant documentation is changed or added

Release Notes

Notes: no-notes

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[jkleinsc]

@MAKIO135 nice catch! Thanks for the PR!

[jkleinsc]

Merging as CI failure unrelated to doc change.

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