minor #8031 Fixed typo in Encore/Shared-Entry page (King2500)

This PR was submitted for the master branch but it was merged into the 3.3 branch instead (closes #8031).

Discussion
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Fixed typo in Encore/Shared-Entry page

*see changes*

I think "asssets" with 3 "s" was not intended..  ;)

Commits
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4e236a1 Fixed typo in Encore/Shared-Entry page

Author: weaverryan

frontend/encore/shared-entry.rst

@@ -10,8 +10,8 @@ that's included on every page:
 
     Encore
         // ...
-        .addEntry('page1', 'asssets/js/page1.js')
-        .addEntry('page2', 'asssets/js/page2.js')
+        .addEntry('page1', 'assets/js/page1.js')
+        .addEntry('page2', 'assets/js/page2.js')
 
         // this creates a 'vendor.js' file with jquery and the bootstrap JS module
         // these modules will *not* be included in page1.js or page2.js anymore