DOCS-520 correcting smart quotes

Author: Sam Kleinman

source/applications/aggregation.txt

@@ -120,14 +120,14 @@ using the following format:
 .. code-block:: javascript
 
    {
-    title : “this is my title” ,
-    author : “bob” ,
+    title : "this is my title" ,
+    author : "bob" ,
     posted : new Date () ,
     pageViews : 5 ,
-    tags : [ “fun” , “good” , “fun” ] ,
+    tags : [ "fun" , "good" , "fun" ] ,
     comments : [
-                { author :“joe” , text : “this is cool” } ,
-                { author :“sam” , text : “this is bad” }
+                { author :"joe" , text : "this is cool" } ,
+                { author :"sam" , text : "this is bad" }
     ],
     other : { foo : 5 }
    }
@@ -144,10 +144,10 @@ command:
         author : 1,
         tags : 1,
      } },
-     { $unwind : “$tags” },
+     { $unwind : "$tags" },
      { $group : {
         _id : { tags : "$tags" },
-        authors : { $addToSet : “$author” }
+        authors : { $addToSet : "$author" }
      } }
    );