docs: add typst and typstfmt (#267)

- adds typst and typstfmt to the list of known formatters in the docs

docs/formatters.md

@@ -39,6 +39,8 @@ Single-language formatters:
   - [shfmt](#shfmt)
 - [Terraform](#terraform)
   - [terraform fmt](#terraform-fmt)
+- [Typst](#typst)
+  - [typstfmt](#typstfmt)
 
 Multilanguage formatters:
 
@@ -237,6 +239,15 @@ options = ["fmt"]
 includes = ["*.tf"]
 ```
 
+## Typst
+
+### [typstfmt](https://github.com/astrale-sharp/typstfmt)
+
+```
+command = "typstfmt"
+includes = ["*.typ", "*.typst"]
+```
+
 ## Multi-language formatters
 
 ### [clang-format](https://clang.llvm.org/docs/ClangFormat.html)