Clarify that references docs are only for the most recent version of borgmatic.

docs/reference/command-line.md

@@ -7,11 +7,17 @@ eleventyNavigation:
 ---
 ## borgmatic options
 
-Here are all of the available borgmatic command-line options, including the
-separate options for each action sub-command. Note that most of the
-flags listed here do not have equivalents in borgmatic's [configuration
+Here are all of the available borgmatic command-line flags for the most recent
+version of borgmatic, including the separate flags for each action
+(sub-command). Most of the flags listed here do not have equivalents in
+borgmatic's [configuration
 file](https://torsion.org/borgmatic/docs/reference/configuration/).
 
+If you're using an older version of borgmatic, some of these flags may not be
+present in that version, and you should instead use `borgmatic --help` or
+`borgmatic [action name] --help` (where `[action name]` is the name of an
+action like `list`, `create`, etc.).
+
 ```
 {% include borgmatic/command-line.txt %}
 ```

docs/reference/configuration.md

@@ -7,11 +7,17 @@ eleventyNavigation:
 ---
 ## Configuration file
 
-Here is a full sample borgmatic configuration file including all available options: 
+Below is a sample borgmatic configuration file including all available options
+for the most recent version of borgmatic. This file is also [available for
+download](https://torsion.org/borgmatic/docs/reference/config.yaml).
+
+If you're an older version of borgmatic, some of these options may not work,
+and you should instead [generate a sample configuration file specific to your
+borgmatic
+version](https://torsion.org/borgmatic/docs/how-to/set-up-backups/#configuration).
 
 ```yaml
 {% include borgmatic/config.yaml %}
 ```
 
 Note that you can also [download this configuration
-file](https://torsion.org/borgmatic/docs/reference/config.yaml) for use locally.