docs(pipes): minor text updates

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

@@ -16,15 +16,15 @@ block includes
   We almost think of them as styles.
   In fact, we'd like to apply them in our HTML templates as we do styles.
 p.
-  Welcome, Angular pipes, the simple display-value transformations that we can declare in our HTML!
+  Welcome, Angular pipes - the simple display-value transformations that we can declare in our HTML!
   Try the #[+liveExampleLink2()].
 
 .l-main-section
 :marked
   ## Using Pipes
 
   A pipe takes in data as input and transforms it to a desired output.
-  We'll illustrate by transforming a component's birthday property into
+  We'll illustrate this by transforming a component's birthday property into
   a human-friendly date:
 
 +makeExample('pipes/ts/app/hero-birthday1.component.ts', null, 'app/hero-birthday1.component.ts')(format='.')
@@ -103,7 +103,7 @@ figure.image-display
   We can chain pipes together in potentially useful combinations.
   In the following example, we chain the birthday to the `DatePipe` and on to the `UpperCasePipe`
   so we can display the birthday in uppercase. The following birthday displays as
-  **<samp>APR 15, 1988</samp>**
+  **<samp>APR 15, 1988</samp>**.
 
 +makeExample('pipes/ts/app/app.component.html', 'chained-birthday')(format=".")
 
@@ -123,7 +123,7 @@ figure.image-display
 +makeExample('pipes/ts/app/exponential-strength.pipe.ts', null, 'app/exponential-strength.pipe.ts')(format=".")
 
 :marked
-  This pipe definition reveals several key points
+  This pipe definition reveals several key points:
 
   * A pipe is a class decorated with pipe metadata.