Ability to choose codeblock language about gomarkdoc HOT 2 OPEN

Hi @retr0h, is your desire to be able to specify one language to be used across all code blocks generated by the tool, or do you want some sort of syntax to customize each code block based on context?

The first option is more feasible but would likely only be of value to certain projects (the readme in this project, for example, has a mix of golang code blocks and generic ones). The second option is more powerful, but would likely require some new syntax that isn't part of the go doc spec, something I've been trying to avoid thus far

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Hi @retr0h, is your desire to be able to specify one language to be used across all code blocks generated by the tool, or do you want some sort of syntax to customize each code block based on context?

I was thinking of the first approach.

Similar to how github lets one embed diff types of code in markdown.

```go
go code here

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