Merge pull request #326 from lBilali/patch-4

Update postgres.md

Author: wangxiaoying

docs/databases/postgres.md

@@ -14,7 +14,7 @@ Adding `sslmode=require` to connection uri parameter force SSL connection. Examp
 import connectorx as cx
 conn = 'postgres://username:password@server:port/database'         # connection token
 query = "SELECT * FROM table"                                   # query string
-cx.read_sql(conn, query)                                        # read data from BigQuery
+cx.read_sql(conn, query)                                        # read data from Postgres
 ```
 
 ## Postgres-Pandas Type Mapping
@@ -58,4 +58,4 @@ cx.read_sql(conn, query)                                        # read data from
 
 <p align="center"><img alt="memory chart" src="https://raw.githubusercontent.com/sfu-db/connector-agent/main/assets/pg-mem.png"/></p>
 
-In conclusion, ConnectorX uses **3x** less memory and **13x** less time compared with Pandas.
+In conclusion, ConnectorX uses **3x** less memory and **13x** less time compared with Pandas.