Address comments on Dist Profiling Recipe

[rohan-varma]

Addresses @mrshenli 's comments on #1068

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[brianjo]

@rohan-varma Could rebase this? I'll merge it as soon as it passes tests.

[rohan-varma]

@brianjo I couldn't find the file "distributed_rpc_profiling.rst" in master or in pytorch/release:1.6 anymore - do you or @jlin27 know where it went? Anyways, I added it back in this PR.

[jlin27]

It's under the prototype_source folder: https://github.com/pytorch/tutorials/tree/master/prototype_source

Starting with the 1.6 release, all tutorials with features marked prototype were added into this folder so that they wouldn't show up on the website. The rationale is that prototype features are based off of unstable code so we didn't want users running across prototype tutorials and expecting them to work based off of stable code. Only more experienced users who knew about the feature would be able to reference these hidden tutorials.

The idea was that once the feature was no longer prototype, it would be "graduated" out of that folder into (into intermediate_source or one of the other sources).

[brianjo]

OK I'm going to merge this one and remove the prototype file. Thanks @jlin27!