Mention why the op is not used in with-safe-transport

Author: r0man

src/cider/nrepl/middleware/inspect.clj

@@ -130,6 +130,9 @@
     (and (= op "eval") inspect)
     (handle-eval-inspect handler msg)
 
+    ;; This is outside of `with-safe-transport` because it streams the pretty
+    ;; printed result to the client in multiple messages. It does NOT return any
+    ;; value, which is expected by `with-safe-transport`.
     (= op "inspect-print-current-value")
     (print-current-value-reply msg)