[skip ci] Fix typos in README.md (#5857)

packages/babel-plugin-transform-runtime/README.md

@@ -152,19 +152,21 @@ var _marked = [foo].map(regeneratorRuntime.mark);
 
 function foo() {
   return regeneratorRuntime.wrap(function foo$(_context) {
-    while (1) switch (_context.prev = _context.next) {
-      case 0:
-      case "end":
-        return _context.stop();
+    while (1) {
+      switch (_context.prev = _context.next) {
+        case 0:
+        case "end":
+          return _context.stop();
+      }
     }
   }, _marked[0], this);
 }
 ```
 
-This isn't ideal as then you have to include the regenerator runtime which
+This isn't ideal since it relies on the regenerator runtime being included, which
 pollutes the global scope.
 
-Instead what the `runtime` transformer does it compile that to:
+With the `runtime` transformer, however, it is compiled to:
 
 ```javascript
 "use strict";
@@ -178,11 +180,13 @@ function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { de
 var _marked = [foo].map(_regenerator2.default.mark);
 
 function foo() {
-  return regeneratorRuntime.wrap(function foo$(_context) {
-    while (1) switch (_context.prev = _context.next) {
-      case 0:
-      case "end":
-        return _context.stop();
+  return _regenerator2.default.wrap(function foo$(_context) {
+    while (1) {
+      switch (_context.prev = _context.next) {
+        case 0:
+        case "end":
+          return _context.stop();
+      }
     }
   }, _marked[0], this);
 }