Added more DOxygen-style comments #757

Job	Run time
windows-msvc-shared (JSON)	12m 49s
windows-msvc-shared (FLEXBUFFERS)	5m 35s
windows-msvc-shared (BOOST_SERIALIZATION)	7m 34s
windows-msvc-shared (CAPNPROTO)	8m 4s
windows-msvc-shared (XML)	4m 12s
windows-msvc-shared (TOML)	4m 38s
windows-msvc-shared (UBJSON)	7m 9s
windows-msvc-shared (YAML)	5m 31s
windows-msvc-shared (MSGPACK)	4m 4s
windows-msvc-shared (PARQUET)	37m 31s
windows-msvc-shared (AVRO)	7m 22s
windows-msvc (TOML)	8m 4s
windows-msvc (MSGPACK)	1m 48s
windows-msvc (UBJSON)	1m 47s
windows-msvc (AVRO)	57s
windows-msvc-shared (CBOR)	8m 5s
windows-msvc (PARQUET)	1m 47s
windows-msvc (BOOST_SERIALIZATION)	57s
windows-msvc (XML)	8m 4s
windows-msvc (benchmarks)	8m 4s
windows-msvc (CAPNPROTO)	8m 4s
windows-msvc (FLEXBUFFERS)	8m 4s
windows-msvc (JSON)	8m 4s
windows-msvc (CBOR)	8m 4s
windows-msvc (CEREAL)	8m 4s
windows-msvc (YAML)	8m 4s
	3h 12m 26s

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