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Add a sentence to describe New session command in New Request section

Change-Id: I4ac4d6273e9d10afa2ac0b73b0e47d760df0f117
no-try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585108Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Auto-Submit: Shengfa Lin <shengfa@google.com>
Cr-Commit-Position: refs/heads/master@{#836771}