Update engagements.md for typo (#5730)

Author: MichaelBDavis

nuxt/content/handbook/sales/engagements.md

@@ -52,7 +52,7 @@ Follow these steps to create a quote.
 
 1. In HubSpot, open the relevant Deal. In the Quotes area, click Add to begin a
    new quote.
-   - Ensure the Deal Type is set up, "Expension" is an in-term upsel
+   - Ensure the Deal Type is set up, "Expansion" is an in-term upsell
 2. Fill in the Buyer Information section. This will pre-fill with the
    information from the contact in the Deal.
 3. The default Quote creator will be you. Change this if necessary.