FlexLayout:Flex Layout Simple Usage

Build 212 on layouts-docs-elaborate
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The baseline is larger than the new snapshot (1184x583 to 1173x511).
Baseline History
Build 212b4cd7da
Current build. There are unaccepted changes, so build 86 is still the baseline.
Build 867a52d78 current baseline
Accepted by Zhihao Cui.
Build 16035ab45
Accepted by Zhihao Cui.
Build 1cf98200
Auto-accepted
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