Adjusted documentation

Documented the C-style comments with an example.

Author: altmannmarcelo

src/dialect/mod.rs

@@ -899,6 +899,7 @@ pub trait Dialect: Debug + Any {
     }
 
     /// Returns true if the dialect supports hint and C-style comments
+    /// e.g. `/*! hint */`
     fn supports_c_style_comments(&self) -> bool {
         false
     }