cli docs: document that --config-toml can be repeated

cli/src/cli_util.rs

@@ -2292,7 +2292,7 @@ pub struct EarlyArgs {
     // Parsing with ignore_errors will crash if this is bool, so use
     // Option<bool>.
     pub no_pager: Option<bool>,
-    /// Additional configuration options
+    /// Additional configuration options (can be repeated)
     //  TODO: Introduce a `--config` option with simpler syntax for simple
     //  cases, designed so that `--config ui.color=auto` works
     #[arg(

cli/tests/test_global_opts.rs

@@ -430,7 +430,7 @@ fn test_help() {
       -v, --verbose                      Enable verbose logging
           --color <WHEN>                 When to colorize output (always, never, auto)
           --no-pager                     Disable the pager
-          --config-toml <TOML>           Additional configuration options
+          --config-toml <TOML>           Additional configuration options (can be repeated)
     "###);
 }