fix some examples (#346)

Author: mmalerba

src/app/shared/documentation-items/documentation-items.ts

@@ -54,7 +54,7 @@ const DOCS: {[key: string]: DocCategory[]} = {
           name: 'Form field',
           examples: [
             'form-field-overview',
-            'form-field-placeholder',
+            'form-field-label',
             'form-field-hint',
             'form-field-error',
             'form-field-prefix-suffix',
@@ -105,7 +105,21 @@ const DOCS: {[key: string]: DocCategory[]} = {
       summary: 'Sidenavs, toolbars, menus',
       items: [
         {id: 'menu', name: 'Menu', examples: ['menu-icons']},
-        {id: 'sidenav', name: 'Sidenav', examples: ['sidenav-fab']},
+        {
+          id: 'sidenav',
+          name: 'Sidenav',
+          examples: [
+            'sidenav-overview',
+            'sidenav-drawer-overview',
+            'sidenav-position',
+            'sidenav-open-close',
+            'sidenav-mode',
+            'sidenav-disable-close',
+            'sidenav-autosize',
+            'sidenav-fixed',
+            'sidenav-responsive'
+          ]
+        },
         {id: 'toolbar', name: 'Toolbar', examples: ['toolbar-multirow']},
       ]
     },
@@ -149,8 +163,8 @@ const DOCS: {[key: string]: DocCategory[]} = {
       name: 'Data table',
       items: [
         {id: 'table', name: 'Table', examples: [
-          'table-filtering', 
-          'table-pagination', 
+          'table-filtering',
+          'table-pagination',
           'table-sorting',
           'table-http',
           'table-overview',