ci: Changes from #160- Invoke the mandoc linter (#296)

* ci: Changes from #160- Invoke the mandoc linter

* Add check.sh from #160 too

* Fix mandoc

doc/check.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# We have to filter this STYLE error out, because it is very platform specific
+OUTPUT=$(mandoc -Tlint "$1" | grep --invert-match "STYLE: referenced manual not found")
+
+if [ -z "$OUTPUT" ]
+then
+	exit 0
+else
+	echo "$1 is malformatted, check mandoc -Tlint $1"
+	echo "$OUTPUT"
+	exit 1
+fi