libs.doxy_template: remove obsolete COLS_IN_ALPHA_INDEX
this was unused given ALPHABETICAL_INDEX = NO; quiets a warning with
doxygen 1.9.1:
warning: Tag 'COLS_IN_ALPHA_INDEX' at line 1110 of file 'doxyfile' has
become obsolete.
Change-Id: I66561486e160aa461efb6ee2bb7b7afd699b8ac1
diff --git a/libs.doxy_template b/libs.doxy_template
index 6382c69..6e042ac 100644
--- a/libs.doxy_template
+++ b/libs.doxy_template
@@ -1099,12 +1099,6 @@
# The default value is: YES.
ALPHABETICAL_INDEX = NO
-# The COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns in
-# which the alphabetical index list will be split.
-# Minimum value: 1, maximum value: 20, default value: 5.
-# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
-
-COLS_IN_ALPHA_INDEX = 5
# 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. The IGNORE_PREFIX tag
