Update intake_introduction.ipynb

Eliminate stray period in link to datetime foundations page

Author: ktyle

notebooks/intake_introduction.ipynb

@@ -41,7 +41,7 @@
     "\n",
     "| Concepts | Importance | Notes |\n",
     "| --- | --- | --- |\n",
-    "| [Times and Dates in Python](https://foundations.projectpythia.org/core/datetime/datetime.) | Necessary | |\n",
+    "| [Times and Dates in Python](https://foundations.projectpythia.org/core/datetime/datetime) | Necessary | |\n",
     "| [Intro to Xarray](https://foundations.projectpythia.org/core/xarray/xarray-intro) | Necessary | |\n",
     "| [Intro to Cartopy](https://foundations.projectpythia.org/core/cartopy/cartopy) | Helpful | |\n",
     "| [Understanding of Zarr](https://zarr.readthedocs.io/en/stable/) | Helpful | |\n",