[Docs]: Upgrade guide does not cover <HashRouter slashType="noslash">

[Whaileee]

Describe what's incorrect/missing in the documentation

New HashRouter seems to only support /#/path format. I can't seem to find information about that case, and also I've been struggling to make it work with /#path scenario. Help appreciated! Thanks

[timdorr]

This has never been a prop of HashRouter. You may be referring to a different library.

[Whaileee]

I'm sorry for the typo. I meant hashType and it has been a prop of HashRouter in v4/v5.