[boost][range] - Trac 5971 - size() should return an unsigned type.

[SVN r77990]

doc/style.qbk

@@ -13,7 +13,7 @@ Since ranges are characterized by a specific underlying iterator type, we get a
   * Readable Range
   * Writeable Range
   * Swappable Range
-  * Lvalue Range 
+  * Lvalue Range
 * [*/Traversal/] category:
   * __single_pass_range__
   * __forward_range__
@@ -25,7 +25,7 @@ Notice how we have used the categories from the __new_style_iterators__.
 Notice that an iterator (and therefore an range) has one [*/traversal/] property and one or more properties from the [*/value access/] category. So in reality we will mostly talk about mixtures such as
 
 * Random Access Readable Writeable Range
-* Forward Lvalue Range 
+* Forward Lvalue Range
 
 By convention, we should always specify the [*/traversal/] property first as done above. This seems reasonable since there will only be one [*/traversal/] property, but perhaps many [*/value access/] properties.
 
@@ -37,7 +37,7 @@ As another example, consider how we specify the interface of `std::sort()`. Algo
    template< class RandomAccessTraversalReadableWritableIterator >
    void sort( RandomAccessTraversalReadableWritableIterator first,
               RandomAccessTraversalReadableWritableIterator last );
-`` 
+``
 
 For ranges the interface becomes
 
@@ -45,6 +45,6 @@ For ranges the interface becomes
    template< class RandomAccessReadableWritableRange >
    void sort( RandomAccessReadableWritableRange& r );
 ``
- 
+
 [endsect]