The README file contains a mixture of Markdown and non-Markdown syntax.
Refurbish the document and use only Markdown syntax according to the
specification in [1].

[1] https://www.markdownguide.org/



Change-Id: If58f4e2971dc798a03a78841226804ab1f2d33c8
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/8387


Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins