Update docs for dSYMs and flutter-symbols (#1533) #6314

Job	Run time
Check licenses	41s
Static Analyzer - Diff Aware	34s
Static Analyzer - Non Diff Aware	37s
Build and test (14)	3m 12s
Test standalone binary in macOS	4m 11s
Build and test (16)	2m 48s
Build and test (18)	2m 33s
Test standalone binary in ARM macOS	1m 56s
Test standalone binary in ubuntu	1m 41s
Build and test (20)	2m 22s
Test standalone binary in ARM ubuntu	1m 23s
Test standalone binary in windows	3m 58s
End-to-end test the package (14)	4m 38s
End-to-end test the package (16)	4m 44s
End-to-end test the package (18)	4m 53s
End-to-end test the package (20)	4m 32s
	44m 43s

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