[DOC] update complement docs

docs/content/tools/complement.rst

 ###############
 *complement*
 ###############
-**complementBed** returns the intervals in a genome that are not by the features in a feature file. An
-example usage of this tool would be to return the intervals of the genome that are not annotated as a
-repeat.
 
+|
+
+.. image:: ../images/tool-glyphs/complement-glyph.png 
+    :width: 600pt 
+
+|
+
+
+``bedtools complement`` returns all intervals in a genome that are **not**
+covered by at least one interval in the input BED/GFF/VCF file.
+
+    
+.. seealso::
+
+    :doc:`../tools/merge`
+    
 
 ==========================================================================
 Usage and option summary
 ==========================================================================
-Usage:
+**Usage**:
 ::
-  complementBed [OPTIONS] -i <BED/GFF/VCF> -g <GENOME>
 
-**No additional options.**
+  bedtools complement -i <BED/GFF/VCF> -g <GENOME>
 
+**(or)**:
+::
 
+  complementBed -i <BED/GFF/VCF> -g <GENOME>
 
 
 ==========================================================================
 Default behavior
 ==========================================================================
-Figure:
-::
-  Chromosome  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-  
-  BED FILE A     *************   ***************     ******************              
-  
-  Result      ===             ===               =====                  =======
+By default, ``bedtools complement`` returns all genomic intervals that are not
+covered by at least one record from the input file.
 
+.. code-block:: bash
 
-For example:
-::
-  cat A.bed
+  $ cat A.bed
   chr1  100  200
   chr1  400  500
   chr1  500  800
 
-  cat my.genome
+  $ cat my.genome
   chr1  1000
+  chr2  800
+  
+  $ bedtools complement -i A.bed -g my.genome
+  chr1  0   100
+  chr1  200 400
+  chr1  800 1000
+  chr2  0   800
 
-  complementBed -i A.bed -g my.genome
-  chr1  0    100
-  chr1  200  400
-  chr1  800  1000