Update documentation for get helper (#1750)

* update get helper with string & integer use

* Apply suggestions from code review

Co-authored-by: James C. Davis <jamescdavis@gmail.com>

* Apply suggestions from code review

Co-authored-by: Isaac Lee <16869656+ijlee2@users.noreply.github.com>

Co-authored-by: James C. Davis <jamescdavis@gmail.com>
Co-authored-by: Isaac Lee <16869656+ijlee2@users.noreply.github.com>

Author: 3 people

guides/release/components/helper-functions.md

@@ -208,9 +208,22 @@ For the full list of available helpers, you can check the [template helpers API
 ### The `get` helper
 
 The [`{{get}}`](https://api.emberjs.com/ember/release/classes/Ember.Templates.helpers/methods/get?anchor=get)
-helper makes it easy to dynamically send the value of a variable to another
-helper or component. This can be useful if you want to output one of several
-values based on the result of a getter.
+helper makes it easy to dynamically look up a property on an object or an element in an array. The second argument to `{{get}}` can be a string or a number, depending on the object being accessed.
+
+
+To access a property on an object with a string key:
+
+```handlebars
+{{get this.someObject "object_key"}}
+```
+
+To access the first element in an array:
+
+```handlebars
+{{get this.someArray 0}}
+```
+
+To access a property on an object with a dynamic key:
 
 ```handlebars
 {{get this.address this.part}}
@@ -219,6 +232,7 @@ values based on the result of a getter.
 If the `part` getter returns "zip", this will display the result of `this.address.zip`.
 If it returns "city", you get `this.address.city`.
 
+
 ### The `concat` helper
 
 We mentioned above that helpers can be nested. This can be