chore: add a note about .npmrc customization (#4459) (CP: main)

[vaadin-bot]

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AI Language Review

In the updated document, "Node.js," the following issue requires improvement:

1. The section discussing the customization of the .npmrc file when using PNPM includes a sentence: "make sure to remove the NOTICE: this is an auto-generated file comment to prevent Vaadin to overwrite it with the default contents." The phrase "to prevent Vaadin to overwrite it" should be corrected to "to prevent Vaadin from overwriting it" for grammatical correctness.