updated docs

docs/docs/imaging.xml

@@ -210,6 +210,7 @@
          <item>toMat</item>
 
          <item>draw_line</item> 
+         <item>draw_rectangle</item> 
          <item>draw_fhog</item> 
          <item>fill_rect</item> 
          <item>assign_image</item> 
@@ -1008,6 +1009,18 @@
                                  
       </component>
             
+   <!-- ************************************************************************* -->
+      
+      <component>
+         <name>draw_rectangle</name>
+         <file>dlib/image_transforms.h</file>
+         <spec_file link="true">dlib/image_transforms/draw_abstract.h</spec_file>
+         <description>        
+            This global function draws a rectangle on an image.
+         </description>
+                                 
+      </component>
+            
    <!-- ************************************************************************* -->
       
       <component>

docs/docs/term_index.xml

@@ -973,7 +973,11 @@
          <term file="dlib/gui_widgets/style_abstract.h.html" name="scroll_bar_style" include="dlib/gui_widgets.h"/>
          <term file="dlib/gui_widgets/style_abstract.h.html" name="scroll_bar_style_default" include="dlib/gui_widgets.h"/>
 
-         <term file="dlib/gui_widgets/canvas_drawing_abstract.h.html" name="draw_rectangle" include="dlib/gui_widgets.h"/>
+         <term name="draw_rectangle">
+            <term link="dlib/gui_widgets/canvas_drawing_abstract.h.html#draw_rectangle" name="for the GUI canvas object" include="dlib/gui_widgets.h"/>
+            <term link="imaging.html#draw_rectangle" name="for image/array2d objects"    include="dlib/image_transforms.h"/>
+         </term>
+
          <term file="dlib/gui_widgets/canvas_drawing_abstract.h.html" name="draw_circle" include="dlib/gui_widgets.h"/>
          <term file="dlib/gui_widgets/canvas_drawing_abstract.h.html" name="draw_pixel" include="dlib/gui_widgets.h"/>
          <term file="dlib/gui_widgets/canvas_drawing_abstract.h.html" name="draw_solid_circle" include="dlib/gui_widgets.h"/>