Corrected spelling of loaded tag 'wagtailimages_tags' (#11610)

Corrected spelling in getting started documentation.
From 'wagtailimages_tag' to 'wagtailimages_tags'

CONTRIBUTORS.md

@@ -794,6 +794,7 @@
 * Karthik Ayangar
 * mirusu400
 * Advik Kabra
+* Ankur Raiyani
 
 ## Translators
 

docs/getting_started/tutorial.md

@@ -667,7 +667,7 @@ class BlogPage(Page):
     ]
 ```
 
-This method is now available from your templates. Update `blog_index_page.html` to load the `wagtailimages_tag` and include the main image as a thumbnail alongside each post:
+This method is now available from your templates. Update `blog_index_page.html` to load the `wagtailimages_tags` library and include the main image as a thumbnail alongside each post:
 
 ```html+django
 <!-- Load wagtailimages_tags: -->