Update upload_speed.rst

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: ijash
:x: ivankravets
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[valeros]

Hi @ijash, thanks for the PR. Please see my comments above:

[ijash]

Hi @ijash, thanks for the PR. Please see my comments above:

hi, which one?

[valeros]

hi, which one?

They should be visible now as review comments

[ijash]

@valeros please review

[ivankravets]

Thanks for the PR!