Ejecting SD card info (#2645)

* Adding ejection info to Key Information page

Author: ajl721

docs/key-information.md

@@ -148,11 +148,11 @@ Some of the files that you will be asked to download come in the `.zip` file for
 
 When you are told to "copy (file) from (file).zip", that means that you need to open (or "extract") the ZIP file. Inside the ZIP file will be the file you're looking for, after which you can copy it to the specified location on your SD card.
 
-On most operating systems, you can extract files by double-clicking the file. If this doesn't work, you can install a reputable third-party extraction tool like [7-zip](https://7-zip.org/) instead.
+On most operating systems, you can extract files by double-clicking the file. If this doesn't work, you can install a reputable third-party extraction tool like [7-Zip](https://7-zip.org/) instead.
 
 ::: warning
 
-The Windows application "WinRAR" is specifically known to cause compatibility issues with the 3DS, particularly with custom firmware installation exploits. If you are on a Windows computer, you should use either the default File Explorer or 7-zip to extract files.
+The Windows application "WinRAR" is specifically known to cause compatibility issues with the 3DS, particularly with custom firmware installation exploits. If you are on a Windows computer, you should use either the default File Explorer or 7-Zip to extract files.
 
 :::
 
@@ -170,6 +170,20 @@ If your computer is running Windows, file extensions may be hidden by default, w
 
 ::::
 
+:::: details What does it mean to "eject" an SD card?
+
+::: info
+
+![](/images/screenshots/onboarding/eject-windows.png)
+
+:::
+
+On most devices, your file manager will have an Eject (⏏️) button for your SD card. Using this option safely stops all activity and unmounts the card so it can be removed.
+
+This is **very** important because removing the SD card while it is in use can cause corruption and may negatively affect the outcome of exploits when modding your 3DS.
+
+::::
+
 ## Getting help
 
 If you experience an issue while following this guide, there are many ways that you can get help!