[Imported] Latency numbers: remove conversion to throughput

[ido777]

Imported from donnemartin/system-design-primer#427

Original author: @psanan

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Remove conversion of latency numbers to throughput.

This is misleading for two reasons:

1. Latency and throughput are not computable from each other. For example: if I know it takes 1 second to turn on the hose, get 1 liter of water, and turn it off, I cannot conclude that the maximum rate I can get water out of the hose is 1 liter per second (though I can conclude it's more than that).
2. The throughput estimates seem suspect, in and of themselves. These are great numbers to know, of course, but need to be backed by a separate source. (This'll be extra important if and when this guide includes information about, say, GPUs, which are optimized for throughput).

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