R2 Data Catalog: add some precisions to Get Started

Author: netgusto

src/content/docs/r2/data-catalog/get-started.mdx

@@ -144,7 +144,7 @@ We will use [marimo](https://github.com/marimo-team/marimo) as a Python notebook
 5.  Install marimo with uv:
 
         ```py
-        uv pip install marimo
+        uv pip install marimo pandas pyarrow pyiceberg
         ```
 
 </Steps>
@@ -271,6 +271,12 @@ We will use [marimo](https://github.com/marimo-team/marimo) as a Python notebook
 
 3.  Replace the `CATALOG_URI`, `WAREHOUSE`, and `TOKEN` variables with your values from sections **2** and **3** respectively.
 
+4.  Run the script you just created:
+
+        ```
+        marimo run r2-data-catalog-tutorial.py
+        ```
+
 </Steps>
 In the Python notebook above, you: