Fix markdown lint on docs/

[montyly]

To be able to merge the new doc in secure-contracts today, I ended up disabling the markdown lint on the doc folder

slither/.github/workflows/linter.yml

Lines 47 to 49 in 7f54c8b

	- name: Remove part of the doc
	run: |
	rm -rf docs/src/

This should be only a temporary solution

None of the warnings were significant, but it will take a bit of time to fix them all