Merge pull request #481 from zerowe-seven/0.6.0

#329 The error message in TableNotExistMsg has a grammatical error

core/src/server/grpc_impl/request/GrpcBaseRequest.cpp

@@ -90,7 +90,7 @@ GrpcBaseRequest::SetStatus(ErrorCode error_code, const std::string& error_msg) {
 std::string
 GrpcBaseRequest::TableNotExistMsg(const std::string& table_name) {
     return "Table " + table_name +
-           " not exist. Use milvus.has_table to verify whether the table exists. You also can check if the table name "
+           " does not exist. Use milvus.has_table to verify whether the table exists. You also can check whether the table name "
            "exists.";
 }