Move docs about "submit type" to "config-project-config.txt"

Change-Id: If65e60628ac69803798c056e86e8815ede6a7f43

Documentation/rest-api-changes.txt

diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index ccec37b1..ea33d02 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -5760,7 +5760,7 @@
 Whether the change was reviewed by the calling user.
 Only set if link:#reviewed[reviewed] is requested.
 |`submit_type`        |optional|
-The link:project-configuration.html#submit_type[submit type] of the change. +
+The link:config-project-config.html#submit-type[submit type] of the change. +
 Not set for merged changes.
 |`mergeable`          |optional|
 Whether the change is mergeable. +