Docs troubleshooting note on updating to latest client if facing upload speed issues

[dchoi27]

We need to add a note to the Troubleshooting section in the docs:
https://docs.web3.storage/how-tos/troubleshooting

I am experiencing slowness in uploads to web3.storage.

Please make sure that you are using the latest version of web3.storage client: 3.5.6. There is an issue in the latest Node version (nodejs/node#42117) and we reverted using native version of Blob in latest release until that fix is shipped.

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Background info from Discord

[mbommerez]

This needs to be redone in the main repo as the docs have now moved there from their separate repo.
@GaryHomewood have moved it back into the Sprint backlog.

@dchoi27 for your information - this hadn't been merged yet into the old docs. We will redo and then just get it merged without review from Yusef. Let us know if any objections.