doc:tutorial: fix ReST formatting for first `be comment` example

diff --git a/doc/tutorial.txt b/doc/tutorial.txt
index 5af6f333a146f02f78e02da146827ce187d31a36..09d60eb077abf7540ee18e6e449437f46b256f4d 100644 (file)
--- a/doc/tutorial.txt
+++ b/doc/tutorial.txt
@@ -144,7 +144,7 @@ Commenting on bugs
 ------------------
 
 Bugs are like little mailing lists, and you can comment on the bug
-itself or previous comments, attach files, etc.  For example
+itself or previous comments, attach files, etc.  For example::
 
     $ be comment abc/28f "Thoughts about demuxalizers..."
     Created comment with ID abc/28f/97a