fix some links in the tour

Author: kaikalii

site/text/tour.md

@@ -64,19 +64,19 @@ If you like, you can put values on the stack first, then operate on them.
 ×++ 1 2 3 4
 ```
 
-[Dup](/docs/dup) duplicates the top value on the stack.
+[duplicate](/docs/dup) duplicates the top value on the stack.
 
 ```uiua
 ×.3
 ```
 
-[Dup](/docs/dup) is often used in the examples on this site to show both the input and output of a function.
+[duplicate](/docs/dup) is often used in the examples on this site to show both the input and output of a function.
 
 ```uiua
 √.225
 ```
 
-For math functions where the order matters, like [sub](/docs/sub) and [div](/docs/div), what would normally be the second argument is instead the first. This is so you can think of fragments like `¯2` as a single unit.
+For math functions where the order matters, like [subtract](/docs/sub) and [divide](/docs/div), what would normally be the second argument is instead the first. This is so you can think of fragments like `¯2` as a single unit.
 
 If you want them to work the other way, you can use [flip](/docs/flip), which swaps the top two values on the stack.