documentation: btrbk.1: add "exclude" command line option

btrbk

@@ -318,6 +318,7 @@ options:
        --version             display version information
    -c, --config=FILE         specify configuration file
    -n, --dry-run             perform a trial run with no changes made
+       --exclude=FILTER      exclude configured sections
    -p, --preserve            preserve all (do not delete anything)
        --preserve-snapshots  preserve snapshots (do not delete snapshots)
        --preserve-backups    preserve backups (do not delete backups)

doc/btrbk.1.asciidoc

@@ -17,7 +17,7 @@ SYNOPSIS
 
 [verse]
 btrbk [-h|--help] [--version]
-      [-c|--config <file>] [-n|--dry-run]
+      [-c|--config <file>] [-n|--dry-run] [--exclude <filter>]
       [-p|--preserve] [--preserve-snapshots] [--preserve-backups]
       [-v|--verbose] [-q|--quiet] [-l|--loglevel <level>]
       [-t|--table] [--format <output-format>]
@@ -82,6 +82,10 @@ OPTIONS
     commands. Use in conjunction with '-l debug' to see the btrfs
     commands that would be executed.
 
+--exclude <filter>::
+    Exclude configured sections matching '<filter>'. See
+    <<_filter_statements,FILTER STATEMENTS>> below
+
 -p, --preserve::
     Preserve all snapshots and backups. Skips deletion of any
     snapshots and backups, even if specified in the configuration file