CONTRIBUTING.rst: use make lint to run shellcheck

`make check` could get extended to include other things besides just linting.

CONTRIBUTING.rst: use make lint to run shellcheck
eec944cd · nl6720 · d7fc56e0 · eec944cd
Unverified Commit eec944cd authored 4 years ago by nl6720
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -17,7 +17,7 @@ All ash and bash scripts are linted using shellcheck:

  .. code:: bash

-    make check
+    make lint

 Testing
 =======