Merge pull request #3037 from e0/patch-1

docs: add missing comma

web/spec/postgres.yml

@@ -107,7 +107,7 @@ pages:
           ```sql
           create table table_name (
             column_1 data_type,
-            column_2 data_type
+            column_2 data_type,
             -- Constraints:
             primary key (column_1, column_2)
           );
@@ -322,4 +322,4 @@ pages:
         sql: |
           ```bash
           host=hostname port=5432 dbname=databasename user=username password=secret
-          ```
+          ```