chore(table): remove native docs (#11705)

Author: andrewseguin

src/demo-app/table/table-demo.ts

@@ -23,7 +23,6 @@ export class TableDemo {
     'table-filtering',
     'table-footer-row',
     'table-http',
-    'table-native-only',
     'table-overview',
     'table-pagination',
     'table-row-context',

src/lib/table/table.md

@@ -373,12 +373,3 @@ selectors. For example, `<table mat-table>` becomes `<mat-table>`; `<tr mat-row`
 
 Note that this approach means you cannot include certain native-table features such colspan/rowspan
 or have columns that resize themselves based on their content.
-
-### Applying material styles to native table
-
-If you want to have a Material design styled `<table>` without using the `MatTable`, simply apply 
-the appropriate classes to the table elements. This may be useful if you have an existing table
-or if you do not need the additional benefits and features of the `MatTable`.
-
-<!--- example(table-native-only) -->
-