doc: clarify mv --exchange

In the manual, say it exchanges all data and metadata.
Suggested by Pádraig Brady in:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69532#59

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index ffe47aad542254e3b7c8c7396a3b449a2dac09d8..e36269588bb55b08a4b4b3219a70452984b6fa96 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -10277,6 +10277,7 @@ fail with a diagnostic instead of copying and then removing the file.
 @opindex --exchange
 Exchange source and destination instead of renaming source to destination.
 Both files must exist; they need not be the same type.
+This exchanges all data and metadata.
 
 This option can be used to replace one directory with another.
 When used this way, it should be combined with