[PATCH] find.1: avoid misunderstanding of `-prtinf %Ak` description

* find/find.1 (-printf): Make it clear that strftime() format
description in this man page is incomplete and refer to the
strftime() documentation instead.

Suggested in https://bugzilla.redhat.com/1882695
---
 find/find.1 | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/find/find.1 b/find/find.1
index ee7c6842..0bc882b3 100644
--- a/find/find.1
+++ b/find/find.1
@@ -1420,9 +1420,8 @@ File's last access time in the format returned by the C `ctime' function.
 File's last access time in the format specified by
 .IR k ,
 which is either `@' or a directive for the C `strftime' function.
-The possible values for \fIk\fR are listed below;
-some of them might not be available on all systems,
-due to differences in `strftime' between systems.
+Below is an excerpt of possible values for \fIk\fR.  For full list
+please refer to documentation of `strftime'.
 .RS
 .IP @
 seconds since Jan.\& 1, 1970, 00:00 GMT, with fractional part.
-- 
2.25.4