Merge pull request #5947 from TylerMSFT/fixdropdown

remove bad entry in dev langs-shows up as blank in dropdown

Author: denrea

docs/docfx.json

@@ -50,7 +50,6 @@
         "cplusplus"
       ],
       "dev_langs": [
-        "C++",
         "cpp"
       ],
       "searchScope": [