Add note about retry in timeout documentation (#2298)

Co-authored-by: Sindre Sorhus <[email protected]>

Author: paescuj

documentation/6-timeout.md

@@ -7,6 +7,8 @@ Source code: [`source/core/timed-out.ts`](../source/core/timed-out.ts)
 It is a good practice to set a timeout to prevent hanging requests.\
 By default, there is no timeout set.
 
+Note: The [`retry` configuration](7-retry.md) also applies to timeouts.
+
 **All numbers refer to milliseconds.**
 
 ```js