fix typo from https://trac.osgeo.org/grass/changeset/64384

Also remove a space from the end of line, however they are all over the file.


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@64388 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.colortable/d.colortable.html

@@ -45,7 +45,7 @@ lines and columns (the full graphics frame), all categories from the
 map's color table will be displayed. However, if the user requests 
 that the color table associated with a map which has 10 data categories 
 be displayed in a graphics frame with only 3 lines (rows) and 2 columns 
-6(a total of six cells), 
+(a total of six cells), 
 only six of the ten map categories will be displayed. 
 
 <p>The user should run <em><a href="d.erase.html">d.erase</a></em>