help: unjumble the list of default config values for `internals.config` stable

help: unjumble the list of default config values for `internals.config`

--- a/mercurial/help/internals/config.txt	Mon Nov 05 15:01:45 2018 -0800
+++ b/mercurial/help/internals/config.txt	Thu Nov 08 20:04:07 2018 -0500
@@ -99,10 +99,11 @@
 then stay in use until compatibility with Mercurial 4.2 is dropped.
 
 As reminder, here are the default values for each config type:
-- config:      None
-- configbool:  False
-- configbytes: 0
-- configdate:  None
-- configint:   None
-- configlist:  []
-- configpath:  None
+
+    - config:      None
+    - configbool:  False
+    - configbytes: 0
+    - configdate:  None
+    - configint:   None
+    - configlist:  []
+    - configpath:  None