Add constructors to the methods for controlling bucket size in unordered containers.

[SVN r54914]

doc/buckets.qbk

@@ -115,6 +115,15 @@ or close to the hint - unless your hint is unreasonably small or large.
 [table Methods for Controlling Bucket Size
     [[Method] [Description]]
 
+    [
+        [`X(size_type n)`]
+        [Construct an empty container with at least `n` buckets (`X` is the container type).]
+    ]
+    [
+        [`X(InputIterator i, InputIterator j, size_type n)`]
+        [Construct an empty container with at least `n` buckets and insert elements
+         from the range \[`i`, `j`) (`X` is the container type).]
+    ]
     [
         [`float load_factor() const`]
         [The average number of elements per bucket.]