specify return type for encoding function-constant

examples/z_bytes.c

@@ -51,7 +51,7 @@ int main(void) {
     assert(input_u32 == output_u32);
     z_drop(z_move(payload));
     // Corresponding encoding to be used in operations options like `z_put()`, `z_get()`, etc.
-    // encoding = z_encoding_zenoh_uint32();
+    // const z_loaned_encoding_t *encoding = z_encoding_zenoh_uint32();
 
     // String, also work with and z_owned_string_t
     const char *input_str = "test";
@@ -62,7 +62,7 @@ int main(void) {
     z_drop(z_move(payload));
     z_drop(z_move(output_string));
     // Corresponding encoding to be used in operations options like `z_put()`, `z_get()`, etc.
-    // encoding = z_encoding_zenoh_string();
+    // const z_loaned_encoding_t *encoding = z_encoding_zenoh_string();
 
     // Bytes, also work with z_owned_slice_t
     const uint8_t input_bytes[] = {1, 2, 3, 4};
@@ -73,7 +73,7 @@ int main(void) {
     z_drop(z_move(payload));
     z_drop(z_move(output_bytes));
     // Corresponding encoding to be used in operations options like `z_put()`, `z_get()`, etc.
-    // encoding = z_encoding_zenoh_bytes(); // (the default value)
+    // const z_loaned_encoding_t *encoding = z_encoding_zenoh_bytes(); // (the default value)
 
     // Writer reader
     uint8_t input_writer[] = {0, 1, 2, 3, 4};