minor typos (#4011)

src/core/vdom/create-component.js

@@ -236,7 +236,7 @@ function resolveAsyncComponent (
 }
 
 function extractProps (data: VNodeData, Ctor: Class<Component>): ?Object {
-  // we are only extrating raw values here.
+  // we are only extracting raw values here.
   // validation and default values are handled in the child
   // component itself.
   const propOptions = Ctor.options.props

src/platforms/web/runtime/directives/model.js

@@ -59,7 +59,7 @@ export default {
       setSelected(el, binding, vnode.context)
       // in case the options rendered by v-for have changed,
       // it's possible that the value is out-of-sync with the rendered options.
-      // detect such cases and filter out values that no longer has a matchig
+      // detect such cases and filter out values that no longer has a matching
       // option in the DOM.
       const needReset = el.multiple
         ? binding.value.some(v => hasNoMatchingOption(v, el.options))

src/server/render-stream.js

@@ -1,7 +1,7 @@
 /* @flow */
 
 /**
- * Original RenderStream implmentation by Sasha Aickin (@aickin)
+ * Original RenderStream implementation by Sasha Aickin (@aickin)
  * Licensed under the Apache License, Version 2.0
  * http://www.apache.org/licenses/LICENSE-2.0
  *