fixed typo in 1-endless-page

Author: Shih-Hao

2-ui/3-event-details/8-onscroll/1-endless-page/solution.md

@@ -18,7 +18,7 @@ For instance, if the height of the whole HTML document is 2000px, then:
 document.documentElement.getBoundingClientRect().top = 0
 
 // window-relative bottom = 2000
-// the document is long, so that is probably far beyound the window bottom
+// the document is long, so that is probably far beyond the window bottom
 document.documentElement.getBoundingClientRect().bottom = 2000
 ```
 

2-ui/3-event-details/8-onscroll/1-endless-page/task.md

@@ -12,7 +12,7 @@ Like this:
 
 Please note two important features of the scroll:
 
-1. **The scroll is "elastic".** We can scroll a little beyound the document start or end in some browsers/devices (empty space below is shown, and then the document will automatically "bounces back" to normal).
+1. **The scroll is "elastic".** We can scroll a little beyond the document start or end in some browsers/devices (empty space below is shown, and then the document will automatically "bounces back" to normal).
 2. **The scroll is imprecise.** When we scroll to page end, then we may be in fact like 0-50px away from the real document bottom.
 
 So, "scrolling to the end" should mean that the visitor is no more than 100px away from the document end.