Update platform-collections-backinsertiterator-class.md

I believe the `---` was here in error.

Author: Colin Robertson

docs/cppcx/platform-collections-backinsertiterator-class.md

@@ -53,15 +53,13 @@ The BackInsertIterator class implements the rules required by the [back_insert_i
 
 **Namespace:** Platform::Collections
 
----
 ## <a name="ctor"></a>  BackInsertIterator::BackInsertIterator Constructor
 
 Initializes a new instance of the `BackInsertIterator` class.
 
 ## Syntax
 
 ```
-
 explicit BackInsertIterator(
    Windows::Foundation::Collections::IVector<T>^ v);
 ```
@@ -119,7 +117,6 @@ Returns a reference to the current BackInsertIterator. The iterator is unmodifie
 ## Syntax
 
 ```
-
 BackInsertIterator& operator++();
 
 BackInsertIterator operator++(int);