[docgen] Update docs

skip-checks: true

README.md

@@ -232,6 +232,7 @@ You can view this list in vim with `:help conform-formatters`
 - [nixfmt](https://github.com/serokell/nixfmt) - nixfmt is a formatter for Nix code, intended to apply a uniform style.
 - [nixpkgs_fmt](https://github.com/nix-community/nixpkgs-fmt) - nixpkgs-fmt is a Nix code formatter for nixpkgs.
 - [ocamlformat](https://github.com/ocaml-ppx/ocamlformat) - Auto-formatter for OCaml code.
+- [packer_fmt](https://developer.hashicorp.com/packer/docs/commands/fmt) - The packer fmt Packer command is used to format HCL2 configuration files to a canonical format and style.
 - [pangu](https://github.com/vinta/pangu.py) - Insert whitespace between CJK and half-width characters.
 - [perlimports](https://github.com/perl-ide/App-perlimports) - Make implicit Perl imports explicit.
 - [perltidy](https://github.com/perltidy/perltidy) - Perl::Tidy, a source code formatter for Perl.

doc/conform.txt

@@ -253,6 +253,8 @@ FORMATTERS                                                    *conform-formatter
          style.
 `nixpkgs_fmt` - nixpkgs-fmt is a Nix code formatter for nixpkgs.
 `ocamlformat` - Auto-formatter for OCaml code.
+`packer_fmt` - The packer fmt Packer command is used to format HCL2
+             configuration files to a canonical format and style.
 `pangu` - Insert whitespace between CJK and half-width characters.
 `perlimports` - Make implicit Perl imports explicit.
 `perltidy` - Perl::Tidy, a source code formatter for Perl.