docs(template-syntax): interpolation only for strings #3041 (#3066)

Author: wardbell

Diff for: public/docs/ts/latest/guide/template-syntax.jade

@@ -571,15 +571,14 @@ a(id="one-time-initialization")
   The following binding pairs do the same thing:
 +makeExample('template-syntax/ts/app/app.component.html', 'property-binding-vs-interpolation')(format=".")
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-  Interpolation is a convenient alternative for property binding in many cases.
-  In fact, Angular  translates those interpolations into the corresponding property bindings
-  before rendering the view.
+  _Interpolation_ is a convenient alternative to _property binding_ in many cases.
 
-  There is no technical reason to prefer one form to the other.
+  When rendering data values as strings, there is no technical reason to prefer one form to the other.
   We lean toward readability, which tends to favor interpolation.
   We suggest establishing coding style rules and choosing the form that
   both conforms to the rules and feels most natural for the task at hand.
 
+  When setting an element property to a non-string data value, you must use _property binding_.
 
 :marked
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