Update Learn-Queries.md (graphql#467)

change to once, you would need to repeat at least once

Author: soaringeagle

site/learn/Learn-Queries.md

@@ -98,7 +98,7 @@ In the above example, the two `hero` fields would have conflicted, but since we
 
 ## Fragments
 
-Let's say we had a relatively complicated page in our app, which let us look at two heroes side by side, along with their friends. You can imagine that such a query could quickly get complicated, because we would need to repeat the fields at least twice - one for each side of the comparison.
+Let's say we had a relatively complicated page in our app, which let us look at two heroes side by side, along with their friends. You can imagine that such a query could quickly get complicated, because we would need to repeat the fields at least once - one for each side of the comparison.
 
 That's why GraphQL includes reusable units called _fragments_. Fragments let you construct sets of fields, and then include them in queries where you need to. Here's an example of how you could solve the above situation using fragments: