docs: Fix ThoughtSpot instructions (Postgres → Redshift)

Author: igorlukanin

docs/pages/product/configuration/visualization-tools/thoughtspot.mdx

@@ -19,7 +19,7 @@ connect to ThoughtSpot.
 
 ## Connecting from ThoughtSpot
 
-ThoughtSpot connects to Cube as a Postgres database.
+ThoughtSpot connects to Cube as an Amazon Redshift database.
 
 ### Creating a connection
 
@@ -28,7 +28,7 @@ data source:
 
 <Screenshot src="https://ucarecdn.com/85bd8325-efd9-4cae-a463-e9b025a667cc/" />
 
-Enter a name for the data source, choose <Btn>Postgres</Btn> as the data
+Enter a name for the data source, choose <Btn>Amazon Redshift</Btn> as the data
 warehouse and click <Btn>Continue</Btn> in the header.
 
 Enter credentials from the previous step and click <Btn>Continue</Btn>: