Fixed typo

Author: eltronix

public/docs/ts/latest/guide/pipes.jade

@@ -253,7 +253,7 @@ figure.image-display
   More often we don't know when the data have changed,
   especially in applications that mutate data in many ways,
   perhaps in application locations far away.
-  A component is such an application usually can't know about those changes.
+  A component in such an application usually can't know about those changes.
   Moreover, it's unwise to distort our component design to accommodate a pipe.
   We strive as much as possible to keep the component class independent of the HTML.
   The component should be unaware of pipes.