Update names to match convention

Author: FeudalDiana

content/en-us/luau/stacks.md

@@ -26,18 +26,18 @@ function Stack.new()
 end
 
 -- Check if the stack is empty
-function Stack:IsEmpty()
+function Stack:isEmpty()
 	return #self._stack == 0
 end
 
 -- Put a new value onto the stack
-function Stack:Push(value)
+function Stack:push(value)
 	table.insert(self._stack, value)
 end
 
 -- Take a value off the stack
-function Stack:Pop()
-	if self:IsEmpty() then
+function Stack:pop()
+	if self:isEmpty() then
 		return nil
 	end
 
@@ -57,21 +57,21 @@ local s = Stack.new()
 
 -- Change the stack 	Resulting stack		 Output
 
-s:Push(1)      			-- {1}
+s:push(1)      			-- {1}
 
-s:Push(5)      			-- {1, 5}
+s:push(5)      			-- {1, 5}
 
-s:Push(10)     			-- {1, 5, 10}
+s:push(10)     			-- {1, 5, 10}
 
-print(s:Pop()) 			-- {1, 5}            10
+print(s:pop()) 			-- {1, 5}            10
 
-print(s:Pop()) 			-- {1}               5
+print(s:pop()) 			-- {1}               5
 
-s:Push(20)     			-- {1, 20}
+s:push(20)     			-- {1, 20}
 
-print(s:Pop()) 			-- {1}               20
+print(s:pop()) 			-- {1}               20
 
-print(s:Pop()) 			-- {}                1
+print(s:pop()) 			-- {}                1
 ```
 
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