mdx:fixed layout example

Build 21222 on select-args-serialization
1200px
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BaselineBuild 18843 on fix/addon-docs/fixed-position
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NewBuild 21222 on select-args-serialization
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The baseline is shorter than the new snapshot (1200x900 to 1200x943).
Baseline History
Build 2122249ad24f
Current build. There are unaccepted changes, so build 18843 is still the baseline.
Build 18843ab4d4b4 current baseline
Accepted by Michael Shilman.
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