DocÖ Fix typo about spf lookup (experimental)

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index aa85847d88af043404c89d7199fcd36d8759109c..0b1afb2478f0e142e123c454554dea2f78cd5d78 100644 (file)
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -451,7 +451,7 @@ would relax host matching rules to a broader network range.
 A lookup expansion is also available. It takes an email
 address as the key and an IP address as the database:
 
-  $lookup (username@domain} spf {ip.ip.ip.ip}}
+  ${lookup {username@domain} spf {ip.ip.ip.ip}}
 
 The lookup will return the same result strings as they can appear in
 $spf_result (pass,fail,softfail,neutral,none,err_perm,err_temp).