Fix verilog vs chisel doc rendering

**Type of issue**: bug report | documentation

**Impact**: no functional change

**Development Phase**: request

**Other information**

**If the current behavior is a bug, please provide the steps to reproduce the problem:**

visit https://www.chisel-lang.org/chisel3/docs/cookbooks/verilog-vs-chisel

https://github.com/chipsalliance/chisel3/pull/2323#issuecomment-1074349506

**What is the current behavior?**

https://www.chisel-lang.org/chisel3/docs/cookbooks/verilog-vs-chisel does not render HTML properly.

**What is the expected behavior?**

* HTML code should not show up in the generated doc
* code blocks should work

**Please tell us about your environment:**

**What is the use case for changing the behavior?**