docs(scoring): http2 redirect PWA score issue

[adaschevici]

…ails

Summary

Adds a note to the docs about a small issue in PWA scoring with simplehttp2server package.

This is a docs change.

It's required because it has been causing some issues and they are not being documented as known issues.

Related Issues/PRs

#1217
#5910

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[paulirish]

5910 repeated twice btw ;)

[adaschevici]

my bad, copy-paste fail

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