Fix typos in package description (#2838) #4373

Job	Run time
build (stable, examples/counter)	1m 16s
build (stable, examples/marvel)	1m 10s
build (stable, examples/pub)	1m 7s
build (stable, examples/random_number)	1m 9s
build (stable, examples/stackoverflow)	1m 5s
build (stable, examples/todos)	1m 25s
build (stable, packages/riverpod)	3m 52s
build (stable, packages/riverpod/example)	1m 14s
build (stable, packages/flutter_riverpod)	1m 34s
build (stable, packages/flutter_riverpod/example)	1m 5s
build (stable, packages/hooks_riverpod)	1m 8s
build (stable, packages/hooks_riverpod/example)	1m 28s
build (stable, packages/riverpod_annotation)	1m 3s
build (stable, packages/riverpod_generator)	2m 17s
build (stable, packages/riverpod_generator/integration/build_yaml)	1m 53s
build (stable, website)	1m 2s
build (master, examples/counter)	1m 56s
build (master, examples/marvel)	1m 42s
build (master, examples/pub)	1m 45s
build (master, examples/random_number)	1m 29s
build (master, examples/stackoverflow)	1m 49s
build (master, examples/todos)	1m 50s
build (master, packages/riverpod)	4m 3s
build (master, packages/riverpod/example)	1m 24s
build (master, packages/flutter_riverpod)	2m 4s
build (master, packages/flutter_riverpod/example)	1m 46s
build (master, packages/hooks_riverpod)	1m 35s
build (master, packages/hooks_riverpod/example)	1m 38s
build (master, packages/riverpod_annotation)	1m 8s
build (master, packages/riverpod_generator)	2m 28s
build (master, packages/riverpod_generator/integration/build_yaml)	2m 4s
build (master, website)	1m 29s
	53m 58s

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