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docs: Fix copy-paste @return in JsonArray.getAsCharacter javadoc #2635

Job	Run time
Build Gson subset	31s
Verify reproducible build	1m 0s
GraalVM Native Image test (JDK 21)	2m 1s
Build on JDK 11	1m 44s
Build on JDK 25	4m 0s
Build on JDK 17	1m 33s
GraalVM Native Image test (JDK 25)	2m 5s
Build on JDK 21	1m 50s
	14m 44s

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