add swift to describeSymbol method

Summary: what is says on the tin

Reviewed By: simonhollis, aahanaggarwal

Differential Revision: D78006106

fbshipit-source-id: 7995f703626a88404c5a45073363acef720184d4

Author: Catherine Gasnier

glean/glass/Glean/Glass/Search.hs

@@ -97,6 +97,8 @@ searchEntityLocation lang toks = case lang of
     fmap (mapResultLocation Code.Entity_scip) <$> Search.symbolSearch toks
   Language_Kotlin ->
     fmap (mapResultLocation Code.Entity_scip) <$> Search.symbolSearch toks
+  Language_Swift ->
+    fmap (mapResultLocation Code.Entity_scip) <$> Search.symbolSearch toks
   lang ->
     return $ None $ "searchEntity: language not supported: " <> toShortCode lang