Fix code snippets in README (#2)

Author: barweiss

README.md

@@ -62,21 +62,21 @@ a, b := tup.Values()
 Tuples implement the `Stringer` and `GoStringer` interfaces.
 
 ```go
-fmt.Println("%s", tuple.New2("hello", "world"))
+fmt.Printf("%s\n", tuple.New2("hello", "world"))
 // Output:
 // ["hello" "world"]
 
-fmt.Println("%#v", tuple.New2("hello", "world"))
+fmt.Printf("%#v\n", tuple.New2("hello", "world"))
 // Output:
 // tuple.T2[string, string]{V1: "hello", V2: "world"}
 ```
 
 # Notes
 
-The tuples code and test code are generated by the `scripts/gen/main.go` script.
+The tuple code and test code are generated by the `scripts/gen/main.go` script.
 
-The generation works by reading `tuple.tpl` and `tuple_test.tpl` using Go's `text/template` engine.
-`tuple.tpl` and `tuple_test.tpl` detail the templated content of a generic tuple class, with variable number of elements.
+Generation works by reading `tuple.tpl` and `tuple_test.tpl` using Go's `text/template` engine.
+`tuple.tpl` and `tuple_test.tpl` contain the templated content of a generic tuple class, with variable number of elements.
 
 # Contributing