refine docs for json.h - issue #548

refine docs for iterator.h - issue #548

refine docs for hash_map.h - issue #548

refine docs for hash_key.h - issue #548

refine docs for common.h - issue #548

refine docs for compare.h - issue #548

refine docs for collection.h - issue #548

refine docs for buffer.h - issue #548

refine docs for array_list.h - issue #548

do not mixup Doxygen command syntax

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