[PATCH 6 of 6 STABLE] doc: make previous line of certificate example end with "::"

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1469999307 -32400
#      Mon Aug 01 06:08:27 2016 +0900
# Branch stable
# Node ID 4e8b014e39bad5e36f4968bcc7a0ce1680066391
# Parent  d6cf79c9ab9e7805c2cd5aba542fe7ff8cf24d84
doc: make previous line of certificate example end with "::"

Before this patch, certificate example is formatted just as normal
text.

diff --git a/mercurial/help/config.txt b/mercurial/help/config.txt
--- a/mercurial/help/config.txt
+++ b/mercurial/help/config.txt
@@ -1082,7 +1082,7 @@ The following per-host settings can be d
     This option has no effect if the per-host ``fingerprints`` option
     is set.
 
-    The format of the file is as follows:
+    The format of the file is as follows::
 
         -----BEGIN CERTIFICATE-----
         ... (certificate in base64 PEM encoding) ...