docs: fix README wording (#1624)

Co-authored-by: rohan436 <rohan.santhoshkumar@googlemail.com>

Author: Rohan5commit

README.md

@@ -64,7 +64,7 @@ import will be the Bubble Tea library, which we'll call `tea` for short.
 ```go
 package main
 
-// These imports will be used later on the tutorial. If you save the file
+// These imports will be used later in the tutorial. If you save the file
 // now, Go might complain they are unused, but that's fine.
 // You may also need to run `go mod tidy` to download bubbletea and its
 // dependencies.