wasmtime: Make Func::store a public method

crates/wasmtime/src/func.rs

@@ -727,9 +727,7 @@ impl Func {
         (get15, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15)
     }
 
-    // This should be `pub(crate)` but the C API happens to need it in one
-    // place.
-    #[doc(hidden)]
+    /// Get a reference to this function's store.
     pub fn store(&self) -> &Store {
         &self.instance.store
     }