Adjust documentation to changes in 'overlays-in' and 'overlays-at'

* src/buffer.c (overlays_in): Fix commentary to match the code.
(Foverlays_in, Foverlays_at): Doc fixes.  (Bug#80242)

* test/src/buffer-tests.el (test-overlays-at-2): Add one test.

* doc/lispref/display.texi (Finding Overlays): Update and improve
the documentation of 'overlays-in' and 'overlays-at'.

* etc/NEWS: Announce the changes.

1 files changed, 1 insertions, 0 deletions

diff --git a/test/src/buffer-tests.el b/test/src/buffer-tests.el
index f4654e90bce..3fae18011fb 100644
--- a/test/src/buffer-tests.el
+++ b/test/src/buffer-tests.el
@@ -905,6 +905,7 @@ should evaporate overlays in both."
       (should-length 1 (overlays-at 10))
       (should-length 1 (overlays-at 20))
       (should-length 0 (overlays-at (point-max)))
+      (should-length 1 (overlays-at (1- (point-max))))
       (narrow-to-region 10 20)
       (should-length 1 (overlays-at (point-min)))
       (should-length 1 (overlays-at 15))