[libgfbgraph/abderrahim/docdir] Makefile.am: use autotools defined docdir

[Abderrahim Kitouni <akitouni src gnome org>]

commit 2e914258bd146c065fca235dee64a9f5c576dd3b
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Thu Jan 27 15:04:08 2022 +0100

    Makefile.am: use autotools defined docdir

 Makefile.am | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 056d414..6c54ec6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,8 +1,7 @@
 SUBDIRS = gfbgraph docs tests
 ACLOCAL_AMFLAGS = -I m4
 
-libgfbgraphdocdir = ${prefix}/doc/libgfbgraph
-libgfbgraphdoc_DATA = \
+doc_DATA = \
        README\
        COPYING\
        AUTHORS\