docs: document RUN_SETUP_GENTLY and clarify RUN_SETUP

diff --git a/RelNotes b/RelNotes
index 155555ef6af91ee7309a047f8280c1c57cac1e62..58c32c35250bcdeb46b0d6340ec3d246a5e6298c 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.8.2.3.txt
\ No newline at end of file
+Documentation/RelNotes/1.9.2.txt
\ No newline at end of file