docs(*): Document a lot more symbols that are missing comments in our generated docs.

modules/angular2/examples/platform/dom/debug/ts/by/by.ts

@@ -0,0 +1,17 @@
+import {By} from 'angular2/platform/browser';
+import {DebugElement, Scope} from 'angular2/core';
+
+var debugElement: DebugElement;
+class MyDirective {}
+
+// #docregion by_all
+debugElement.query(By.all(), Scope.all);
+// #enddocregion
+
+// #docregion by_css
+debugElement.query(By.css('[attribute]'), Scope.all);
+// #enddocregion
+
+// #docregion by_directive
+debugElement.query(By.directive(MyDirective), Scope.all);
+// #enddocregion

modules/angular2/examples/platform/dom/debug/ts/debug_element_view_listener/providers.ts

@@ -0,0 +1,10 @@
+import {Component} from 'angular2/core';
+import {bootstrap, ELEMENT_PROBE_PROVIDERS} from 'angular2/platform/browser';
+
+@Component({selector: 'my-component'})
+class MyAppComponent {
+}
+
+// #docregion providers
+bootstrap(MyAppComponent, [ELEMENT_PROBE_PROVIDERS]);
+// #enddocregion