Add a tip on YAML anchors to docs on dataset layers (#2181)

docs/source/kedro-viz_visualisation.md

@@ -194,6 +194,43 @@ The visualisation now includes the layers:
 
 ![](./images/pipeline_visualisation_with_layers.png)
 
+Duplicated definitions like:
+
+```yaml
+metadata:
+  kedro-viz:
+    layer: raw
+```
+
+can be avoided by leveraging YAML native syntax for anchors and aliases.
+
+Use an anchor (`&`) first, to create a reusable piece of configuration:
+
+```yaml
+_raw_layer: &raw_layer
+  metadata:
+    kedro-viz:
+      layer: 01_raw
+```
+
+And then use aliases (`*`) to reference it:
+
+```yaml
+companies:
+  type: pandas.CSVDataset
+  filepath: data/01_raw/companies.csv
+  <<: *raw_layer
+
+reviews:
+  type: pandas.CSVDataset
+  filepath: data/01_raw/reviews.csv
+  <<: *raw_layer
+
+# Same for other datasets of the raw layer...
+```
+
+See [this example from the Kedro docs](https://docs.kedro.org/en/stable/data/data_catalog_yaml_examples.html#load-multiple-datasets-with-similar-configuration-using-yaml-anchors) for more details.
+
 ## Share a pipeline visualisation
 
 You can save a pipeline structure within a Kedro-Viz visualisation directly from the terminal as follows: