Fix broken Xarray documentation links (#508)

* update Xarray docs link

* update Xarray docs link

Author: kafitzgerald

core/xarray/computation-masking.ipynb

@@ -874,7 +874,7 @@
     "\n",
     "- `weighted`: [Useful for weighting data before applying reductions](https://xarray.pydata.org/en/stable/user-guide/computation.html#weighted-array-reductions)\n",
     "\n",
-    "- [More xarray tutorials and videos](https://xarray.pydata.org/en/stable/tutorials-and-videos.html)\n",
+    "- [More xarray tutorials and videos](https://docs.xarray.dev/en/stable/getting-started-guide/tutorials-and-videos.html)\n",
     "- [Xarray Documentation - Masking with `where()`](https://xarray.pydata.org/en/stable/user-guide/indexing.html#masking-with-where)"
    ]
   }

core/xarray/xarray-intro.ipynb

@@ -288,7 +288,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In addition, if you need more details on how Xarray handles metadata, you can review this [documentation page](http://xarray.pydata.org/en/stable/getting-started-guide/faq.html#approach-to-metadata)."
+    "In addition, if you need more details on how Xarray handles metadata, you can review this [documentation page](https://docs.xarray.dev/en/stable/get-help/faq.html#what-is-your-approach-to-metadata)."
    ]
   },
   {