Fix hyphen used as minus sign

apoleon · Zeno- · commit 60d745126f8c · 2015-01-20T22:47:45.000+10:00
diff --git a/doc/minetest.6 b/doc/minetest.6
@@ -81,7 +81,7 @@ Set world path
 .TP
 \-\-migrate <value>
 Migrate from current map backend to another. Possible values are sqlite3
-and leveldb. Only works when using --server.
+and leveldb. Only works when using \-\-server.
 
 .SH ENVIRONMENT VARIABLES
 
