chore: fix typos in list/grid-list readmes (#1269)

Author: jelbourn

src/lib/grid-list/README.md

@@ -11,7 +11,7 @@ To use `md-grid-list`, import the MdGridList module into your application's NgMo
 
 *my-app-module.ts*
 ```ts
-import {MdGridListModule} from '@angular2-material/gridlist/gridlist';
+import {MdGridListModule} from '@angular2-material/gridlist';
 
 @NgModule({
   imports: [MdGridListModule],

src/lib/list/README.md

@@ -11,7 +11,7 @@ To use `md-list`, import the MdList module into your application's NgModule:
 
 *my-app-module.ts*
 ```ts
-import {MdLisTModule} from '@angular2-material/list/list';
+import {MdListModule} from '@angular2-material/list';
 
 @NgModule({
   imports: [MdListModule],