docs(changeset): Move handling of orderBy to runtime from plantime.

Author: benjie

.changeset/violet-jars-exercise.md

@@ -0,0 +1,11 @@
+---
+"graphile-build": patch
+"graphile-build-pg": patch
+"postgraphile": patch
+"@dataplan/pg": patch
+---
+
+Start migrating away from `applyPlan`/`inputPlan`, when adding an argument to a
+field you can now augment the field's plan resolver via
+`context.addToPlanResolver` hook. Use this and other changes to move handling of
+orderBy to runtime from plantime.