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Doc: Add omitted secondary prompt in inputoutput tutorial (GH-30317)

For the continuation lines, "..." should present as secondary prompt
(cherry picked from commit de28ee8f755760fda13b481a34b1f326984d293a)

Co-authored-by: Chenwei Xiao <chanvinxiao@163.com>
M
Miss Islington (bot) committed
a1a1fd0dee22c9d49040503f6506dfc9308657c0
Parent: 5d3f2fb
Committed by GitHub <noreply@github.com> on 7/23/2022, 9:33:17 AM