minor corrections to data structures tutorials

Author: Andrew Delman

Tutorials_as_Jupyter_Notebooks/ECCO_v4_Coordinates_and_Dimensions_of_ECCOv4_NetCDF_files.ipynb

@@ -4792,9 +4792,6 @@
     "\n",
     "\n",
     "\n",
-    "\n",
-    "### Grid Parameters\n",
-    "\n",
     "Grid parameters are not coordinates in the sense that they help you orient in space or time, but they provide measures of the model grid such as distances and areas.  Let's examine one of these grid geometric variables, *dxG*:"
    ]
   },

Tutorials_as_Jupyter_Notebooks/ECCO_v4_data_structure_basics.ipynb

@@ -124,7 +124,7 @@
    "source": [
     "### Load the ECCO Version 4 Python package\n",
     "\n",
-    "The *ecco_v4_py* is a Python package written specifically for working with the NetCDF output provided in the [nctiles_monthly](ftp://ecco.jpl.nasa.gov/Version4/Release3/nctiles_monthly/) directory of the [ECCO v4 release](ftp://ecco.jpl.nasa.gov/Version4/Release3/)\n",
+    "The *ecco_v4_py* is a Python package written specifically for working with ECCO NetCDF output.\n",
     "\n",
     "See the \"Getting Started\" page in the tutorial for instructions about installing the *ecco_v4_py* module on your machine."
    ]