mdx:fixed layout example

Build 21205 on select-args-serialization
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BaselineBuild 18843 on fix/addon-docs/fixed-position
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NewBuild 21205 on select-args-serialization
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The baseline is shorter than the new snapshot (1200x900 to 1200x943).
Baseline History
Build 21205194abfb
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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