[pangomm] docs/reference/Doxyfile.in: Remove obsolete entry

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 574677f45f66ccbdb4f2f4600902180c17a01198
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Mon Sep 6 16:42:26 2021 +0200

    docs/reference/Doxyfile.in: Remove obsolete entry

 docs/reference/Doxyfile.in | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index 5d410ab..2e64fc9 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -148,7 +148,6 @@ CLANG_OPTIONS          =
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
 ALPHABETICAL_INDEX     = YES
-COLS_IN_ALPHA_INDEX    = 5
 IGNORE_PREFIX          =
 #---------------------------------------------------------------------------
 # Configuration options related to the HTML output