[#3606] Fix a couple of defcustom :type attributes

Author: bbatsov

cider-client.el

@@ -250,7 +250,7 @@ Assuming this is the Clojure map you want to use as `cljfmt' options:
 you need to encode it as the following plist:
 
   \\='((\"indents\" ((\"org.me/foo\" ((\"inner\" 0))))) (\"alias-map\" ((\"me\" \"org.me\"))))"
-  :type 'list
+  :type '(repeat sexp)
   :group 'cider
   :package-version '(cider . "1.1.0"))
 
@@ -317,7 +317,7 @@ nil."
 Here's an example for `pprint':
 
   \\='((\"length\" 50) (\"right-margin\" 70))"
-  :type 'list
+  :type '(repeat sexp)
   :group 'cider
   :package-version '(cider . "0.21.0"))