doc: double quote "psycopg[binary,pool]" in doc for zsh etc. (#607)

Author: badmonster0

docs/docs/getting_started/quickstart.md

@@ -158,7 +158,7 @@ In this example, we'll use the [`psycopg` library](https://www.psycopg.org/) alo
 Please make sure the required packages are installed:
 
 ```bash
-pip install numpy psycopg[binary,pool] pgvector
+pip install numpy "psycopg[binary,pool]" pgvector
 ```
 
 ### Step 4.1: Extract common transformations