Update whitespace output example

[rlaope]

Hello, please check out this PR

I encountered an open source called echo-jwt while browsing several open sources to process jwt-related logic, and while referencing the document, there was a space in the first line of the output example.

However, I'm not sure if it was intentionally spaced, accidentally spaced, or accidentally spaced. If it's a mistake, please merge this PR!

Thank you :)