runtime(doc): clarify when text properties are cleared
related: #15030
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/textprop.txt b/runtime/doc/textprop.txt
index a02a3d5..6b46e06 100644
--- a/runtime/doc/textprop.txt
+++ b/runtime/doc/textprop.txt
@@ -530,7 +530,7 @@
properties below the changed text, so that they still highlight the same text,
thus you don't need to update these.
-
+ *text-prop-cleared*
Text property columns are not updated or copied: ~
- When setting the line with |setline()| or through an interface, such as Lua,