chore(stdlib): Add examples to `Rational` module #8674

Job	Run time
Build and test on macos-latest / Dependencies / Create dependencies cache	6s
Build and test on windows-latest / Dependencies / Create dependencies cache	12s
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	4s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	12m 47s
Build and test on ubuntu-latest / (native) Build and test / (native) Build and test	6m 15s
Build and test on macos-latest / (js) Build and test / (js) Build and test	14m 1s
Build and test on macos-latest / (native) Build and test / (native) Build and test	14m 25s
Build and test on windows-latest / (js) Build and test / (js) Build and test	21m 15s
Build and test on windows-latest / (native) Build and test / (native) Build and test	39m 2s
Test pkg binaries / Test pkg binary on ubuntu-latest	4m 17s
Test pkg binaries / Test pkg binary on macos-latest	4m 24s
Test pkg binaries / Test pkg binary on windows-latest	21s
	1h 57m 9s

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