Fix typo in User Manual

Author: Zephiles

USER_MANUAL.md

@@ -116,7 +116,7 @@ This menu allows you to save and load various settings. The settings are stored
 This menu allows you to view and edit parts of the game's memory. The current options in this menu are as follows:
 1. **Memory Watches** allows you to watch the values of up to 60 memory addresses, with support for up to 10 pointer levels each. Each of these watches can also be displayed on the screen at will.
 
-2. **Memory Editor** allows you to enable a memory editor as well as adjust it's settings. The settings that can be modified are as follows:
+2. **Memory Editor** allows you to enable a memory editor as well as adjust its settings. The settings that can be modified are as follows:
       * **Clear Cache** will clear the data cache and instruction cache of all of the memory that is modified via the editor.
 
       * **Raise System Level** will set a value that will cause most things in the overworld to pause. This will take effect once the editor is initially opened, and also if the setting is changed from within the editor itself.