More testdata formatting fixes (#1199)

executable_semantics/testdata/function/multiple_args.carbon

@@ -17,5 +17,5 @@ fn f(x: i32, y: i32) -> i32 {
 }
 
 fn Main() -> i32 {
-  return f(2,3) - 5;
+  return f(2, 3) - 5;
 }

executable_semantics/testdata/function/param_lifetime.carbon

@@ -20,7 +20,8 @@ fn f(x: i32) -> i32 {
 }
 
 fn Main() -> i32 {
-  var a: i32 = 0; var b: i32 = 1;
+  var a: i32 = 0;
+  var b: i32 = 1;
   f(a);
   b = a;
   return b;

executable_semantics/testdata/function/type_match.carbon

@@ -12,6 +12,6 @@
 package ExecutableSemanticsTest api;
 
 fn Main() -> i32 {
-  var t: (auto, (i32, i32)) = ((1,2),(3,4));
+  var t: (auto, (i32, i32)) = ((1, 2), (3, 4));
   return t[0][0] + t[1][1] - 5;
 }