[sdk/kdiff3] doc/en: Fix SYNOPSIS

[Michael Reeves]

Git commit f4781e60f0cbd1d161b0fea3724b00e441d7d93e by Michael Reeves.
Committed on 24/07/2020 at 19:16.
Pushed by mreeves into branch 'master'.

Fix SYNOPSIS

BUG: 424177
FIXED-IN:1.8.4

M  +3    -3    doc/en/man-kdiff3.1.docbook

https://invent.kde.org/sdk/kdiff3/commit/f4781e60f0cbd1d161b0fea3724b00e441d7d93e

diff --git a/doc/en/man-kdiff3.1.docbook b/doc/en/man-kdiff3.1.docbook
index 7fc2214..010507e 100644
--- a/doc/en/man-kdiff3.1.docbook
+++ b/doc/en/man-kdiff3.1.docbook
@@ -38,9 +38,9 @@
 <arg choice="opt"><option>--noauto</option></arg>
 <arg choice="opt"><option>--auto</option></arg>
 <arg choice="opt"><option>--qall</option></arg>
-<arg choice="opt"><option>-L1</option> <replaceable>alias1</replaceable></arg>
-<arg choice="opt"><option>-L2</option> <replaceable>alias2</replaceable></arg>
-<arg choice="opt"><option>-L3</option> <replaceable>alias3</replaceable></arg>
+<arg choice="opt"><option>--L1</option> <replaceable>alias1</replaceable></arg>
+<arg choice="opt"><option>--L2</option> <replaceable>alias2</replaceable></arg>
+<arg choice="opt"><option>--L3</option> <replaceable>alias3</replaceable></arg>
 <arg choice="opt"><option>-L, --fname</option> <replaceable>alias</replaceable></arg>
 <arg choice="opt"><option>--cs</option> <replaceable>string</replaceable></arg>
 <arg choice="opt"><option>--confighelp</option></arg>