"MARKDOWN" style does not create tables using the minimum 3 hyphens

[michael-nok]

Markdown tables require that we define them using three or more hyphens (---) to create each column’s header. Without three hyphens, certain systems will not interpret this information as a table (for example, DITA-OT transformation to PDF).

Table definition: https://www.markdownguide.org/extended-syntax/#tables

Sample source file: https://github.com/Neoteroi/mkdocs-plugins/blob/main/tests/res/swagger.json

Example command:

oad gen-docs -s json/swagger.json -d docs/swagger.md --style "MARKDOWN"

This is the current Markdown output when using --style "MARKDOWN"

### Cat

| Name | Type |
| -- | -- |                    // This is invalid
| age | integer |
| hunts | boolean |

However, it should in fact be the following:

### Cat

| Name | Type |
| --- | --- |                  // This is valid
| age | integer |
| hunts | boolean |

[RobertoPrevato]

Hi @michael-nok Thank You for reporting this!