test

docs: Add dot shorthands guide to Flutter concepts #7598

Job	Run time
Analyze and test code examples (Beta channel, beta, false)	7m 49s
Check if code excerpts are up to date	23s
Validate Firebase configuration	22s
Analyze and test code examples (Stable channel, stable, true)	7m 12s
Build site and check links	4m 7s
	19m 53s

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