test(rstcheck): ignore Markdown-style links as false positives

.rstcheck.cfg

@@ -1,4 +1,6 @@
 [rstcheck]
 report=info
 ignore_language=rst
-ignore_messages=(Duplicate (ex|im)plicit target.*|Hyperlink target ".*" is not referenced\.$)
+# salt['config.get']('roles') is misidentified as a Markdown link.
+#   Ignore for now, but perhaps try to submit a fix upstream in rstcheck
+ignore_messages=(Duplicate (ex|im)plicit target.*|Hyperlink target ".*" is not referenced\.$|\(rst\) Link is formatted in Markdown style\.)