Changed from three column to two column listing

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@172070 13f79535-47bb-0310-9956-ffa450edef68

doc/Doxyfile

@@ -319,7 +319,7 @@ ALPHABETICAL_INDEX   = YES
 # the COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns
 # in which this list will be split (can be a number in the range [1..20])
 
-COLS_IN_ALPHA_INDEX  = 3
+COLS_IN_ALPHA_INDEX  = 2
 
 # In case all classes in a project start with a common prefix, all
 # classes will be put under the same header in the alphabetical index.