Fix typo in v7 FileManager upgrade notes (#648)

Author: jnoordsij

7.x/upgrade-guide.md

@@ -232,7 +232,7 @@ If the table view still looks wonky (search bar out of place, big + instead of e
 
 Using the File Manager package? Most of the views that weren't in use  were removed, and the dependencies were bumped. If you didn't do any customization you should delete the `resources/views/vendor/elfinder` (`rm -rf resources/views/vendor/elfinder`) folder. No need to publish any views anymore if you are not customizing them. If you were, publish the new view files (`php artisan vendor:publish --provider="Backpack\FileManager\FileManagerServiceProvider" --tag="elfinder-views"`). Then apply your customization on the new files, now located at: `resources/views/vendor/backpack/filemanager/`
 
-Additional the `browse` and `browse_multiple` **fields/columns** are now part of this package. If you previously made any modifications to this fields/columns you should publish the new views (`php artisan vendor:publish --provider="Backpack\FileManager\FileManagerServiceProvider" --tag="filemanger-fields"` and `php artisan vendor:publish --provider="Backpack\FileManager\FileManagerServiceProvider" --tag="filemanager-columns"`), and carry over the modifications from the old files to this new files.
+Additional the `browse` and `browse_multiple` **fields/columns** are now part of this package. If you previously made any modifications to this fields/columns you should publish the new views (`php artisan vendor:publish --provider="Backpack\FileManager\FileManagerServiceProvider" --tag="filemanager-fields"` and `php artisan vendor:publish --provider="Backpack\FileManager\FileManagerServiceProvider" --tag="filemanager-columns"`), and carry over the modifications from the old files to this new files.
 
 #### Backpack/Basset