Addressed Atma's comments about an example workflow of using pipenv

Author: DavidJVitale

guide/01-getting-started/install-and-set-up.ipynb

@@ -121,13 +121,17 @@
     "### Install using pipenv or pip\n",
     "\n",
     "#### Pipenv\n",
-    "[Pipenv](https://docs.pipenv.org/) is the official packaging tool for managing environments and installing packages from the [Python Package Index (PyPI)](https://pypi.python.org/pypi). To install the ArcGIS API for Python from PyPI in a new environment, open a terminal in an empty directory and enter the following command:\n",
+    "[Pipenv](https://docs.pipenv.org/) is the official packaging tool for managing environments and installing packages from the [Python Package Index (PyPI)](https://pypi.python.org/pypi). To install the ArcGIS API for Python from PyPI in a new environment, create a new folder named `your-folder`. Open a terminal, and run `cd /path/to/your-folder` to change directories into `your-folder`. Then, enter the following command to simultaneously create a new environment and install the API in it:\n",
     "\n",
     "```\n",
     "pipenv install arcgis\n",
     "```\n",
     "\n",
-    "This will install the `arcgis` package and create a `Pipfile` in your current working directory. You can activate this environment by running '`pipenv shell`' in this directory. You can also run any command in this environment without activating it by running '`pipenv run {insert_command_here}`'. See [this guide](http://docs.python-guide.org/en/latest/dev/virtualenvs/#installing-packages-for-your-project) for more information. \n",
+    "After running this command, you will notice that a new file named `Pipfile` was created in `your-folder`. A [Pipfile](https://github.com/pypa/pipfile) contains package information that represents a python environment. Open your terminal and make sure you are still in the `your-folder` directory; then, run `pipenv shell`. You have now activated your python environment, the environment that contains the `arcgis` package! You can run `jupyter notebook` or `python` in this environment to start using the API.\n",
+    "    \n",
+    "Pipenv differs from conda and other environment managers in that environments are specific to the folder that contains the Pipfile. In this way, pipenv's use of `Pipfile` is similar to how `npm` uses `package.json`. To learn more about installing and using pipenv, click [here](https://docs.pipenv.org/) or [here](http://docs.python-guide.org/en/latest/dev/virtualenvs/#installing-packages-for-your-project).\n",
+    "\n",
+    "> __Tip__: You can run any command in an environment without activating it by running `pipenv run {insert_command_here}` in a directory with a valid Pipfile.\n",
     "\n",
     "#### Pip\n",
     "\n",
@@ -140,7 +144,7 @@
     "#### Disclaimer\n",
     "You should avoid mixing conda with pipenv/pip: they are completely seperate package managers. It is recommended that you use conda to install the API if you are a beginner user. Read more about the differences [here](https://stackoverflow.com/questions/20994716/what-is-the-difference-between-pip-and-conda) and [here](http://docs.python-guide.org/en/latest/dev/virtualenvs/).\n",
     "\n",
-    "> Note: when installing the ArcGIS API for Python with pipenv/pip, some dependencies may require Microsoft Visual C++ 14.0. If you see any errors related to this, either install the Microsoft Visual C++ tools or install the API without dependencies.\n",
+    "> __Note__: when installing the ArcGIS API for Python with pipenv/pip, some dependencies may require Microsoft Visual C++ 14.0. If you see any errors related to this, either install the Microsoft Visual C++ tools or install the API without dependencies.\n",
     "\n",
     "### Install without Dependencies\n",
     "\n",
@@ -292,7 +296,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.6.5"
   },
   "varInspector": {
    "cols": {