message: docs: updates to minor spelling mistakes in pipes guide
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diff: @@ -340,11 +340,11 @@ code with checkbox switches and additional displays to help you experience these
  Replacing the array is an efficient way to signal Angular to update the display.
  -When do you replace the array? When the data change.
  +When do you replace the array? When the data changes.
  That's an easy rule to follow in *this* example
  where the only way to change the data is by adding a hero.
  -More often, you don't know when the data have changed,
  +More often, you don't know when the data has changed,
  especially in applications that mutate data in many ways,
  perhaps in application locations far away.
  A component in such an application usually can't know about those changes.
  @@ -495,7 +495,7 @@ Write one more impure pipe, a pipe that makes an HTTP request.
  Remember that impure pipes are called every few milliseconds.
  If you're not careful, this pipe will punish the server with requests.
  -In the following code, the pipe only calls the server when the request URL changes and it caches the server response.
  +In the following code, the pipe only calls the server when the requested URL changes and it caches the server response.
  The code uses the [Angular http](guide/http) client to retrieve data:
  