docs: fix up createNodeRequestHandler examples

[gioboa]

Thanks for this great project 🙏
I updated the examples for createNodeRequestHandler because I copied and pasted them and found some typos.

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[alan-agius4]

LGTM, can you kindly squash the commits?

[gioboa]

LGTM, can you kindly squash the commits?

Done 👍

[alan-agius4]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 3db1a17
• 20.3.x: 151636e