remove doc warning.

279ea1b7 · Frederic · de4a73f3 · 279ea1b7 · 279ea1b7
--- a/doc/dev_start_guide.txt
+++ b/doc/dev_start_guide.txt
--- a/doc/index.txt
+++ b/doc/index.txt
@@ -138,6 +138,7 @@ Community
   internal/index
   examples/index
   proposals/index
+   acknowledgement
   LICENSE