clarify resolution in cam exercise

Author: cecilehannay

notebooks/challenge/cam/exercise_1.ipynb

@@ -13,7 +13,6 @@
    "id": "b90d4773-7ca0-4131-ab07-517608a3e976",
    "metadata": {},
    "source": [
-    "\n",
     "<div class=\"alert alert-info\">\n",
     "<strong>Exercise: Customize your CAM history files</strong><br><br>\n",
     " \n",
@@ -22,6 +21,11 @@
     "Run for 5 days, with 3-hourly instantaneous output of the variables: TS, PS, Z500, U850, U200, T850, T500, T200, CLDLOW, PRECT, LHFLX, SHFLX, FLNT, FLNS.\n",
     "You are also welcome to output your own variables\n",
     "\n",
+    "**About the resolution for F2000climo?**\n",
+    "\n",
+    "- Supported resolution for this compset is: ``f09_f09_mg17`` (i.e. 1 degree)\n",
+    "- During the tutorial, we recommend to use : ``f19_f19_mg17`` (i.e. 2 degree) because it will be faster.\n",
+    "  \n",
     "</div>\n"
    ]
   },