docs: shorten Generating Types paragraph in us-core README #1124

Job	Run time
test-mustache-java-r4-example (25)	16s
test-typescript-sdk-r4	13s
test-on-the-fly-example	1m 13s
test-csharp-sdk	1m 43s
test-local-package-folder-example	15s
test-typescript-us-core-example	34s
test-python-sdk	1m 15s
test-python-fhirpy-sdk	1m 26s
test-typescript-ccda-example	1m 13s
test-mustache-java-r4-example (21)	18s
	8m 26s

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