[Java] Fixed link error on library loading on Mac.

Summary:
Fixed link error on library loading on Mac.

Test Plan:
make rocksdbjava
make jtest
[Java] Fix compile error on DbBenchmark.java

Summary:
Fix compile error on DbBenchmark.java

Test Plan:
make rocksdbjava
make jdb_bench
Listing of changes

- JavaDoc readability of RocksObject JavaDoc
- JavaDoc improvements BlockBasedTableConfig, GenericRateLimiterConfig, RocksDB
- JavaDoc improvements MemTableConfig
- JavaDoc improvements RocksObject
- JavaDoc improvements GenericRateLimiterConfig
- JavaDoc improvements ReadOptions
- JavaDoc improvements RateLimiterConfig
- JavaDoc improvements RestoreOptions
- JavaDoc improvements RestoreBackupableDB
- JavaDoc improvements BlockBasedTableConfig
- JavaDoc improvements Options
- JavaDoc improvements BackupableDB and BackupableDBOptions