Update "Further Documentation"

Remove stale pointers in the "Further Documentation"  and just point to RocksDB Wiki

docs/_docs/getting-started.md

@@ -70,9 +70,3 @@ if (s.ok()) s = db->Delete(rocksdb::WriteOptions(), key1);
 ## Further documentation
 
 These are just simple examples of how RocksDB is used. The full documentation is currently on the [GitHub wiki](https://github.com/facebook/rocksdb/wiki). 
-
-Here are some specific details about the RocksDB implementation:
-
-- [Architecture Guide](https://github.com/facebook/rocksdb/wiki/Rocksdb-Architecture-Guide)
-- [Format of an immutable Table file](https://github.com/facebook/rocksdb/wiki/Rocksdb-Table-Format)
-- [Format of a log file](https://github.com/facebook/rocksdb/wiki/Write-Ahead-Log-File-Format)