Update documentation - Add info about due_to_move

Reference: https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#diff-content

Change-Id: I904d217d126623e6e3d5b94245428be34520d719
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index f2f5c15..7142e83 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -6915,6 +6915,8 @@
 link:#diff-intraline-info[DiffIntralineInfo] entity.
 |`due_to_rebase`|not set if `false`|Indicates whether this entry was introduced by a
 rebase.
+|`due_to_move`|not set if `false`|Indicates whether this entry was introduced by a
+move operation.
 |`skip`         |optional|count of lines skipped on both sides when the file is
 too large to include all common lines.
 |`common`       |optional|Set to `true` if the region is common according