updated the docs

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402743

docs/docs/algorithms.xml

@@ -801,7 +801,7 @@
          <file>dlib/geometry.h</file>
          <spec_file link="true">dlib/geometry/vector_abstract.h</spec_file>
          <description>
-            This object represents a three dimensional vector.
+            This object represents a two or three dimensional vector.
          </description>
       </component>