Docs: Fix Windows setup commands
Docs: Fix Windows setup commands

Fix bootstrap/setup instructions for Windows.

Change-Id: I09c3259bf27d2d8baf9579e077b8e1e7b8b490e1

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed