chore(): add form field docs and guide items (#278)

Author: mmalerba

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

@@ -20,6 +20,19 @@ const DOCS = [
       {id: 'autocomplete', name: 'Autocomplete', examples: ['autocomplete-overview']},
       {id: 'checkbox', name: 'Checkbox', examples: ['checkbox-configurable']},
       {id: 'datepicker', name: 'Datepicker', examples: ['datepicker-overview']},
+      {
+        id: 'form-field',
+        name: 'Form field',
+        examples: [
+          'form-field-overview',
+          'form-field-placeholder',
+          'form-field-hint',
+          'form-field-error',
+          'form-field-prefix-suffix',
+          'form-field-theming',
+          'form-field-custom-control',
+        ]
+      },
       {id: 'input', name: 'Input', examples: ['input-form']},
       {id: 'radio', name: 'Radio button', examples: ['radio-ng-model']},
       {id: 'select', name: 'Select', examples: ['select-form']},

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

@@ -34,9 +34,14 @@ const GUIDES = [
   },
   {
     id: 'customizing-component-styles',
-    name: 'Customizing Component Styles',
+    name: 'Customizing component styles',
     document: '/assets/documents/guides/customizing-component-styles.html'
-  }
+  },
+  {
+    id: 'creating-a-custom-form-field-control',
+    name: 'Creating a custom form field control',
+    document: '/assets/documents/guides/creating-a-custom-form-field-control.html'
+  },
 ];
 
 @Injectable()