chore: fix pascalcase

Author: apskhem

rust/catalyst-signed-doc-macro/src/signed_doc_spec/mod.rs

@@ -1,5 +1,7 @@
 //! Catalyst Signed Document spec type
 
+// cspell: words pascalcase
+
 pub(crate) mod content_type;
 pub(crate) mod doc_ref;