Adjust docs and description string to note that check_function_bodies
applies to procedures too.  (In hindsight it should have been named
check_routine_bodies, but it seems too late for that now.)

Daniel Westermann

Discussion: https://postgr.es/m/GV0P278MB04834A9EB9A74B036DC7CE49D2739@GV0P278MB0483.CHEP278.PROD.OUTLOOK.COM