updated '== Summary' section added the word 'to'

I made a small adjustment to the '== Summary' section by adding the word 'to'.

<Original Text>
"The way think about these two different ways of binding is in terms of inputs and outputs." 
- It is missing the word 'to' between 'The way' and 'think' at the start of the sentence

<After Update>
"The way to think about these two different ways of binding is in terms of inputs and outputs."

1.quickstart/6.property-and-event-binding/index.adoc

@@ -182,7 +182,7 @@ Now when we click the button, we set the show property to true which then _unhid
 
 == Summary
 
-The way think about these two different ways of binding is in terms of inputs and outputs.
+The way to think about these two different ways of binding is in terms of inputs and outputs.
 
 * With the `[]` we are binding to an input of a Component.
 * With the `()` we are binding to an output of a Component.
@@ -197,4 +197,4 @@ It is possible to _simulate_ two-way data binding in Angular and we'll cover tha
 [source,typescript]
 ----
 include::{sourcedir}/src/main.ts[]
-----
+----