docs: fix Cypher documentation link in README (#2925)

Author: bitflicker64

README.md

@@ -23,7 +23,7 @@ achieved through the powerful [Gremlin](https://tinkerpop.apache.org/gremlin.htm
 
 ## Features
 
-- Compliant to [Apache TinkerPop 3](https://tinkerpop.apache.org/), supports [Gremlin](https://tinkerpop.apache.org/gremlin.html) & [Cypher](https://en.wikipedia.org/wiki/Cypher) language
+- Compliant to [Apache TinkerPop 3](https://tinkerpop.apache.org/), supports [Gremlin](https://tinkerpop.apache.org/gremlin.html) & [Cypher](https://en.wikipedia.org/wiki/Cypher_(query_language)) language
 - Schema Metadata Management, including VertexLabel, EdgeLabel, PropertyKey and IndexLabel
 - Multi-type Indexes, supporting exact query, range query and complex conditions combination query
 - Plug-in Backend Store Framework, mainly support `RocksDB`/`HStore` + `HBase` for now and you could choose other backends in the [legacy version](https://hugegraph.apache.org/docs/download/download/) ≤ `1.5.0` (like `MySQL/PG`/`Cassandra` ...)