Update docs in Extend_template.ipynb.

Author: ladc

Extend_Template.ipynb

@@ -42,7 +42,7 @@
    "id": "ddaf7d16",
    "metadata": {},
    "source": [
-    "If there does not yet exist an interface for the type of the desired plugin (i.e io, postprocessing, nowcasts, etc) in the pysteps library, then this file must be created. The interface file should be in the .py format. \n",
+    "If there does not yet exist an interface for the type of the desired plugin (i.e io, diagnostics, nowcasts, etc) in the pysteps library, then this file must be created. The interface file should be in the .py format. \n",
     "This interface must contain several key things:\n",
     "1) Dictionaries for each plugin subtype\n",
     "2) A discover_plugins() function to detect newly available plugins\n",
@@ -151,7 +151,7 @@
     "Within this folder create two python files:\n",
     "1. {{cookiecutter.plugin_name}}.py.\n",
     "    - This file will contain the default function layout for all plugins of this type.\n",
-    "    - This file can be copied almost directly from {{cookiecutter.project_name}}/{{cookiecutter.project_slug}}.postprocessor. The only adjustments which need to be made are changing the input and output variables of the function to better match a what is required from this type of plugin.\n",
+    "    - This file can be copied almost directly from {{cookiecutter.project_name}}/{{cookiecutter.project_slug}}.diagnostic. The only adjustments which need to be made are changing the input and output variables of the function to better match a what is required from this type of plugin.\n",
     "2. \\_\\_init\\_\\_.py\n",
     "    - This file will import the functions from the {{cookiecutter.plugin_name}} file"
    ]