Compound index sort rephrasing & typo fix

source/core/index-compound.txt

@@ -79,7 +79,7 @@ as well as both ``item`` and ``stock`` fields:
 .. code-block:: javascript
 
    db.products.find( { item: "Banana" } )
-   db.products.find( { item: "Banana", stock: { gt: 5 } } )
+   db.products.find( { item: "Banana", stock: { $gt: 5 } } )
 
 For details, see :ref:`compound-index-prefix`.
 

source/tutorial/sort-results-with-indexes.txt

@@ -62,12 +62,12 @@ appear in the index. For example, an index key pattern ``{ a: 1, b: 1
 }`` can support a sort on ``{ a: 1, b: 1 }`` but *not* on ``{ b: 1, a:
 1 }``.
 
-The sort must specify the *same sort direction*
-(i.e.ascending/descending) for all its keys as the index key pattern or
-specify the *reverse sort direction* for all its keys as the index key
-pattern. For example, an index key pattern ``{ a: 1, b: 1 }`` can
-support a sort on ``{ a: 1, b: 1 }`` and ``{ a: -1, b: -1 }`` but *not*
-on ``{ a: -1, b: 1 }``.
+For a query to use a compound index for a sort, the specified sort direction
+for all keys in the :method:`cursor.sort()` document must match the index
+key pattern *or* match the inverse of the index key pattern.
+For example, an index key pattern ``{ a: 1, b: -1 }`` can
+support a sort on ``{ a: 1, b: -1 }`` and ``{ a: -1, b: 1 }`` but **not**
+on ``{ a: -1, b: -1 }`` or ``{a: 1, b: 1}``.
 
 .. _sort-index-prefix: