docs: add docstrings

src/cli/validate_config.zig

@@ -20,7 +20,12 @@ pub const Options = struct {
     }
 };
 
-/// The `validate-config` command is used to validate a Ghostty config
+/// The `validate-config` command is used to validate a Ghostty config file.
+///
+/// When executed without any arguments, this will load the config from the default location.
+///
+/// The `--config-file` argument can be passed to validate a specific target config
+/// file in a non-default location.
 pub fn run(alloc: std.mem.Allocator) !u8 {
     var opts: Options = .{};
     defer opts.deinit();

src/config/Config.zig

@@ -1686,6 +1686,7 @@ pub fn loadIter(
     try cli.args.parse(Config, alloc, self, iter);
 }
 
+/// Load configuration from the target config file at `path`.
 pub fn loadFile(self: *Config, alloc: Allocator, path: []const u8) !void {
     var file = try std.fs.cwd().openFile(path, .{});
     defer file.close();