runtime(doc): clarify when text properties are cleared

related: #15030

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index ff995fb..50ff4ec 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1413,6 +1413,8 @@
 :[range]m[ove] {address}			*:m* *:mo* *:move* *E134*
 			Move the lines given by [range] to below the line
 			given by {address}.
+			Any text properties in [range] are cleared
+			|text-prop-cleared|.
 
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 6. Formatting text					*formatting*