fetch: avoid repeated commits in mark_complete

diff --git a/RelNotes b/RelNotes
index dd8bc4bb4ab75e1148cb9b7aaf8ff7384ebb19ec..430d7f1b62878329bb02b5fed5f68c507363a37e 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.6.3.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.5.2.txt
\ No newline at end of file