Revert minor grammar fix to keep PR atomic, fix missing #docregion that caused heroes.component.css to render incorrectly in the summary of changed files.

Author: Adam-Meisen

public/docs/_examples/toh-6/ts/app/heroes.component.css

@@ -1,3 +1,4 @@
+/* #docregion */
 .selected {
   background-color: #CFD8DC !important;
   color: white;
@@ -64,3 +65,4 @@ button.delete-button{
   color:white;
 }
 /* #enddocregion delete-hero */
+/* #enddocregion */

public/docs/ts/latest/tutorial/toh-pt6.jade

@@ -419,15 +419,14 @@ block file-summary
      toh-6/ts/app/hero-detail.component.ts,
      toh-6/ts/app/hero-detail.component.html,
      toh-6/ts/app/hero.service.ts,
-     toh-6/ts/app/in-memory-data.service.ts,
-     toh-6/ts/sample.css`,
+     toh-6/ts/app/in-memory-data.service.ts,`,
     null,
     `app.comp...ts,
      heroes.comp...ts,
      heroes.comp...html,
+     heroes.comp...css,
      hero-detail.comp...ts,
      hero-detail.comp...html,
      hero.service.ts,
-     in-memory-data.service.ts,
-     sample.css`
+     in-memory-data.service.ts,`
   )