parallel docs use incorrect parameter name

[kojiromike]

https://getrector.com/documentation/troubleshooting-parallel#content-configure-parallel refers to a parameter $seconds that is $timeoutSeconds in the code, both for the parallel and for the withParallel methods.

[TomasVotruba]

Indeed 👍 Can you update it?

[TomasVotruba]

Here is the website repo: https://github.com/rectorphp/getrector-com/