Documentation: VSCode Integration; Enable lint highlighting

[SStranks]

Is your feature request related to a problem? Please describe.

Inadequate Documentation: VSCode Integration Page: VSCode Integration

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An additional statement about VSCode integration. While the vscode-graphql extensions are necessary for validation and syntax highlighting, they do not enable lint highlighting for graphql files - the @graphql-eslint/eslint-plugin functions correctly if running eslint from the CLI, and highlights linting in js/ts based files.

To enable visible linting in graphql files, you have to add the following to the VSCode settings:
"eslint.validate": ["graphql"]

I had to track down this thread to find the solution to the problem as it's not documented anywhere: Support Probing for graphql files

Given the plugin is about linting I feel the aforementioned vscode setting should be displayed on the documentation page as a note.

[dimaMachina]

feel free submit pr