The place does the interior key within the TapScript instance come from?

I’m making an attempt to know TapScript logic.

There are two manuals in Bitcoin GitHub: tapscript-example-with-tap and tapscript-example

Appears to me one thing was unsuitable whereas copy-pasting.

sha256 ( ‘inner’ ) is 3bed2cb3a3acf7b6a8...

I don’t perceive the place 1229101a0fcf2104e... comes from?

Supply hyperlink