manuals: Add script to regenerate vty/counter documentation

Change-Id: Ib5e0bd9ec430a6ef3dce6845d7def39720c54637
Depends: Ic5828957a29d4f317e1ebf4f03b5f5359f6250e8 (docker-playground.git)
Related: OS#1700
diff --git a/doc/manuals/Makefile.am b/doc/manuals/Makefile.am
index 0faebf3..a82f95d 100644
--- a/doc/manuals/Makefile.am
+++ b/doc/manuals/Makefile.am
@@ -1,6 +1,7 @@
 EXTRA_DIST = osmomgw-usermanual.adoc \
     osmomgw-usermanual-docinfo.xml \
     osmomgw-vty-reference.xml \
+    regen_doc.sh \
     chapters \
     vty