documentation: terminate options using double dash "--"

btrbk

@@ -402,7 +402,7 @@ sub HELP_MESSAGE
 #80-----------------------------------------------------------------------------
   if($program_name eq "lsbtr") {
     print STDERR <<"END_HELP_LSBTR";
-usage: lsbtr [options] [path]...
+usage: lsbtr [<options>] [[--] <path>...]
 
 options:
    -h, --help                display this help message
@@ -420,7 +420,7 @@ END_HELP_LSBTR
   }
   else {
     print STDERR <<"END_HELP_BTRBK";
-usage: btrbk [options] <command> [filter...]
+usage: btrbk [<options>] <command> [[--] <filter>...]
 
 options:
    -h, --help                display this help message

doc/btrbk.1.asciidoc

@@ -25,7 +25,7 @@ btrbk [-h|--help] [--version]
       [-S|--print-schedule] [--progress]
       [--lockfile <file>]
       [--override <config_option>=<value>]
-      <command> [<args>]
+      <command> [[--] <filter>...]
 
 
 DESCRIPTION

doc/lsbtr.1.asciidoc

@@ -22,7 +22,7 @@ lsbtr [-h|--help] [--version]
       [-v|--verbose]
       [-c|--config <file>]
       [--override <config_option>=<value>]
-      [<path>|<url>...]
+      [[--] <path>|<url>...]
 
 
 DESCRIPTION