[Bug] Loader parameter description error

[simon824]

Problem Type (问题类型)

typo (错别字和描述优化)

Your Question (问题描述)

https://hugegraph.apache.org/docs/quickstart/hugegraph-loader/#341-parameter-description

for example: –host should be updated to -–host

[simon824]

refer to https://github.com/apache/incubator-hugegraph-toolchain/issues/518