docs: Fix PATH issue in the instruction for Windows 10

i.e., "The PATH entry should be the folder where Hugo lives, not the binary."
Fixes #2280.

Also fix a rendering issue with list entries that consist of multiple
paragraphs by using four spaces instead of two.  Special thanks to
@shurcooL for the insight!  (Fixes #2285)

Also made a few minor formatting tweaks.

docs/content/tutorials/installing-on-windows.md

@@ -36,7 +36,7 @@ You'll need a place to store the Hugo executable, your content (the files that y
 
 1. Download the latest zipped Hugo executable from the [Hugo Releases](https://github.com/spf13/hugo/releases) page.
 2. Extract all contents to your `..\Hugo\bin` folder.
-3. In Powershell or your preferred CLI, add the `hugo.exe` executable to your PATH by navigating to `C:\Hugo\bin` (or the location of your hugo.exe file) and use the command `set PATH=%PATH%;C:\Hugo\bin`. If the `hugo` command does not work after a reboot, you may have to run the command prompt as administrator.
+3. In PowerShell or your preferred CLI, add the `hugo.exe` executable to your PATH by navigating to `C:\Hugo\bin` (or the location of your hugo.exe file) and use the command `set PATH=%PATH%;C:\Hugo\bin`. If the `hugo` command does not work after a reboot, you may have to run the command prompt as administrator.
 
 ## Less technical users
 
@@ -48,31 +48,38 @@ You'll need a place to store the Hugo executable, your content (the files that y
 6. You should now have three new files: hugo.exe, license.md, and readme.md. (you can delete the ZIP download now.)
 7. Now add Hugo to your Windows PATH settings:
 
-  #### For Windows 10 users:
+    ### For Windows 10 users:
-  - Right click on the **Start** button
+
-  - Click on **System**
+    - Right click on the **Start** button.
-  - Click on **Advanced System Settings** on the left
+    - Click on **System**.
-  - Click on the **Environment Variables** button on the bottom
+    - Click on **Advanced System Settings** on the left.
-  - In the User variables section, find the row that starts with PATH (PATH will be all caps)
+    - Click on the **Environment Variables...** button on the bottom.
-  - Double-click on **PATH**
+    - In the User variables section, find the row that starts with PATH (PATH will be all caps).
-  - Click the **New** button.
+    - Double-click on **PATH**.
-  - Type in Hugo's path, which is `C:\Hugo\bin\hugo.exe` if you went by the instructions above. Press Enter when you're done typing.
+    - Click the **New...** button.
+    - Type in the folder where `hugo.exe` was extracted, which is `C:\Hugo\bin` if you went by the instructions above. *The PATH entry should be the folder where Hugo lives, not the binary.* Press <kbd>Enter</kbd> when you're done typing.
     - Click OK at every window to exit.
 
-    (Note that the path editor in Windows 10 was added in the large [November 2015 Update](https://blogs.windows.com/windowsexperience/2015/11/12/first-major-update-for-windows-10-available-today/). You'll need to have that or a later update installed for the above steps to work. You can see what Windows 10 build you have by clicking on the Start button → Settings → System → About. See [here](http://www.howtogeek.com/236195/how-to-find-out-which-build-and-version-of-windows-10-you-have/) for more.)
+    > <small>Note that the path editor in Windows 10 was added in the large [November 2015 Update](https://blogs.windows.com/windowsexperience/2015/11/12/first-major-update-for-windows-10-available-today/). You'll need to have that or a later update installed for the above steps to work. You can see what Windows 10 build you have by clicking on the <i class="fa fa-windows"></i>&nbsp;Start button → Settings → System → About. See [here](http://www.howtogeek.com/236195/how-to-find-out-which-build-and-version-of-windows-10-you-have/) for more.)</small>
+
+    ### For Windows 7 and 8.x users:
 
-  #### For Windows 7 and 8.x users
     Windows 7 and 8.1 do not include the easy path editor included in Windows 10, so non-technical users on those platforms are advised to install a free third-party path editor like [Windows Environment Variables Editor](http://eveditor.com/) or [Path Editor](https://patheditor2.codeplex.com/).
 
 ## Verify the executable
 
-Run a few commands to verify that the executable is ready to run and then build a sample site to get started.
+Run a few commands to verify that the executable is ready to run, and then build a sample site to get started.
 
 1. Open a command prompt window.
 
-2. At the prompt, type `hugo help` and press the Enter key. You should see output that starts with:
+2. At the prompt, type `hugo help` and press the <kbd>Enter</kbd> key. You should see output that starts with:
 
-    {{< nohighlight >}}A Fast and Flexible Static Site Generator built with love by spf13 and friends in Go. Complete documentation is available at http://gohugo.io
+    {{< nohighlight >}}hugo is the main command, used to build your Hugo site.
+
+Hugo is a Fast and Flexible Static Site Generator
+built with love by spf13 and friends in Go.
+
+Complete documentation is available at http://gohugo.io/.
 {{< /nohighlight >}}
 
     If you do, then the installation is complete. If you don't, double-check the path that you placed the `hugo.exe` file in and that you typed that path correctly when you added it to your PATH variable. If you're still not getting the output, post a note on the Hugo discussion list (in the `Support` topic) with your command and the output.