docs: document RUN_SETUP_GENTLY and clarify RUN_SETUP

diff --git a/RelNotes b/RelNotes
index 8e86db6ab6eeed617bb208dadba417731c162eae..58c32c35250bcdeb46b0d6340ec3d246a5e6298c 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.8.5.3.txt
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+Documentation/RelNotes/1.9.2.txt
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