Upgrade ember-cli-addon-docs and friends

* Add a dependency on ember-data since it no longer brings along the
  depenency.
* Add newlines to account for bugs in ember-cli-addon-docs. See:
  ember-learn/ember-cli-addon-docs#473 and
  ember-learn/ember-cli-addon-docs#402
* Add a missing `END-SNIPPET` without which parsing of the snippet was
  corrupted

package.json

@@ -54,8 +54,8 @@
     "ember-a11y-testing": "^0.5.0",
     "ember-angle-bracket-invocation-polyfill": "^1.3.1",
     "ember-cli": "~3.1.4",
-    "ember-cli-addon-docs": "0.6.13",
-    "ember-cli-addon-docs-yuidoc": "^0.2.1",
+    "ember-cli-addon-docs": "^1.0.0",
+    "ember-cli-addon-docs-yuidoc": "^1.0.0",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-deploy": "^1.0.2",
     "ember-cli-deploy-build": "^1.1.1",
@@ -66,6 +66,7 @@
     "ember-cli-shims": "^1.2.0",
     "ember-cli-sri": "^2.1.0",
     "ember-cli-uglify": "^2.0.0",
+    "ember-data": "~3.12.0",
     "ember-debug-handlers-polyfill": "^1.1.1",
     "ember-disable-prototype-extensions": "^1.1.2",
     "ember-export-application-global": "^2.0.0",
@@ -77,7 +78,7 @@
     "ember-qunit": "^4.5.1",
     "ember-radio-button": "^1.2.3",
     "ember-resolver": "^5.1.1",
-    "ember-source": "~3.12",
+    "ember-source": "~3.12.0",
     "ember-source-channel-url": "^1.0.1",
     "ember-truth-helpers": "^2.0.0",
     "ember-try": "^1.1.0",

tests/dummy/app/pods/docs/guides/header/fixed-columns/controller.js

@@ -62,6 +62,7 @@ export default Controller.extend({
       { name: 'K', valuePath: 'K' },
     ]);
   }),
+  // END-SNIPPET
 
   actions: {
     toggleFixed(column) {

tests/dummy/app/pods/docs/guides/header/scroll-indicators/template.md

@@ -9,6 +9,7 @@ respective direction.
   {{#demo.example name='scroll-indicators'}}
     <div class="demo-container">
       {{! BEGIN-SNIPPET docs-example-scroll-indicators.hbs }}
+
         <EmberTable as |t|>
           <t.head
             @columns={{columns}}
@@ -33,6 +34,7 @@ them when they are present, or at the edges of the table when they are not.
   {{#demo.example name='scroll-indicators-with-fixed'}}
     <div class="demo-container">
       {{! BEGIN-SNIPPET docs-example-scroll-indicators-with-fixed.hbs }}
+
         <EmberTable as |t|>
           <t.head
             @columns={{columnsWithFixed}}
@@ -47,6 +49,7 @@ them when they are present, or at the edges of the table when they are not.
   {{demo.snippet name='docs-example-scroll-indicators-with-fixed.hbs'}}
   {{demo.snippet name='docs-example-scroll-indicators-with-fixed.js' label='component.js'}}
 {{/docs-demo}}
+
 ## Vertical Scroll Indicators with a Header & Footer
 
 Vertical scroll indicators respect both headers and footers, appearing just
@@ -56,6 +59,7 @@ inside any sticky rows at the top or bottom of the table.
   {{#demo.example name='scroll-indicators-with-footer'}}
     <div class="demo-container">
       {{! BEGIN-SNIPPET docs-example-scroll-indicators-with-footer.hbs }}
+
         <EmberTable as |t|>
           <t.head
             @columns={{columnsWithFooter}}

tests/dummy/app/pods/docs/guides/header/sorting/template.md

@@ -66,7 +66,11 @@ you want to sort the content of the table asynchronously, you can unset the
 `sortFunction` and handle the async request yourself.
 
 ```hbs
-{{ember-thead sortFunction=null}}
+<EmberTable as |t|>
+  <t.head
+    sortFunction=null
+  />
+</EmberTable>
 ```
 
 ## Disabling Sorting