Fix default lightning datadir in lightningd-config doc

doc/lightningd-config.5

@@ -1,13 +1,13 @@
 '\" t
 .\"     Title: lightningd-config
 .\"    Author: [see the "AUTHOR" section]
-.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
-.\"      Date: 11/21/2018
+.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
+.\"      Date: 11/22/2018
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "LIGHTNINGD\-CONFIG" "5" "11/21/2018" "\ \&" "\ \&"
+.TH "LIGHTNINGD\-CONFIG" "5" "11/22/2018" "\ \&" "\ \&"
 .\" -----------------------------------------------------------------
 .\" * Define some portability stuff
 .\" -----------------------------------------------------------------
@@ -31,7 +31,7 @@
 lightningd-config \- Lightning daemon configuration file
 .SH "SYNOPSIS"
 .sp
-\fB~/\&.lightningd/config\fR
+\fB~/\&.lightning/config\fR
 .SH "DESCRIPTION"
 .sp
 When lightningd(8) starts up, it reads a configuration file\&. By default that is \fIconfig\fR in the \fB\&.lightning\fR subdirectory of the home directory (if it exists), but that can be changes by the \fI\-\-lightning\-dir\fR or \fI\-\-conf\fR options on the lightningd(8) command line\&.

doc/lightningd-config.5.txt

@@ -8,7 +8,7 @@ lightningd-config - Lightning daemon configuration file
 
 SYNOPSIS
 --------
-*~/.lightningd/config*
+*~/.lightning/config*
 
 DESCRIPTION
 -----------