Chapter computational performance/hybridize (d2l-ai#828)

* fix errors in 12.1. Compilers and Interpreters

* fix errors in 12.1.1. Symbolic Programming

* fix errors in 12.1.2. Hybrid Programming

* fix errors in 12.1.3. Hybridizing the Sequential Class

* fix errors in 12.1.3.1. Acceleration by Hybridization

* fix errors in 12.1.3.2. Serialization
end of fix erros in 12.1. Compilers and Interpreters

* Update hybridize.md

* Update hybridize.md

Co-authored-by: goldmermaid <[email protected]>