Update README to describe responses as fast rather than instant

Author: robertpiosik

README.md

@@ -31,7 +31,7 @@ Code Web Chat is a free and open-source AI coding extension designed for _speed_
 
 With its focus on context engineering, Code Web Chat positions itself as an alternative to coding agents. We believe that including files in context based on keyword/semantic search is an overly-optimistic approach that may make the model reason about wrong things, possibly causing regressions. These could be especially hard to fix with the very approach that created them.
 
-Although taking care about composition of the context window requires effort, we're rewarded with instant, accurate responses.
+Although taking care about composition of the context window requires effort, it's rewarded with fast, accurate responses.
 
 ## Enabling autofill