Lesson 23, stacks example, run button name doesn't match function name

[duianto]

Issue description:

Lesson 23, stacks example, run button name doesn't match function name

To Reproduce
Steps to reproduce the bug:

1. Go to https://gdquest.github.io/learn-gdscript/staging/#course/lesson-23-append-to-arrays/lesson.tres
2. Scroll down to the heading: Using arrays as stacks
3. See the first interactive example.

Observed behavior

The left panel shows the run button name as: use_top_crate()
but the function name in the right panel is called: use_last_crate()

Expected behavior

The button name should probably match the function name.

Screenshots

Information about your device (please complete the following information):

• Operating System: Windows 10 21H1
• Browser: Microsoft Edge 98.0.1108.62 (Official build) (64-bit)