[Docs] Removed dead link (#6922)

Removed an old link and fixed a typo

docs/feature_ps2_mouse.md

@@ -149,7 +149,7 @@ In your keyboard config.h:
 
 #### PS/2 Mouse Features
 
-These enable settings supported by the PS/2 mouse protocol: http://www.computer-engineering.org/ps2mouse/
+These enable settings supported by the PS/2 mouse protocol.
 
 ```
 /* Use remote mode instead of the default stream mode (see link) */
@@ -202,7 +202,7 @@ Note: you can also use `ps2_mouse_set_resolution` for the same effect (not suppo
 #### Scroll Button
 
 If you're using a trackpoint, you will likely want to be able to use it for scrolling.
-Its possible to enable a "scroll button/s" that when pressed will cause the mouse to scroll instead of moving.
+It's possible to enable a "scroll button/s" that when pressed will cause the mouse to scroll instead of moving.
 To enable the feature, you must set a scroll button mask as follows:
 
 ```