runtime(doc): update doc for clipboard provider

Commit: 
https://github.com/vim/vim/commit/37d61dae7272752269a57da34bff2278e5304f4e
Author: Foxe Chen <[email protected]>
Date:   Fri May 15 09:46:47 2026 +0000

    runtime(doc): update doc for clipboard provider
    
    closes: https://github.com/vim/vim/issues/20217
    
    Signed-off-by: Foxe Chen <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index a73055b09..71585da89 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*     For Vim version 9.2.  Last change: 2026 Feb 14
+*eval.txt*     For Vim version 9.2.  Last change: 2026 May 15
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -5367,6 +5367,9 @@ order:
           is an empty string, then the type is automatically chosen.
        2. A |list| of strings to return to Vim, each representing a line.
 
+If an invalid value is returned, then this is not an error.  Instead the
+register will be left unchanged (not cleared).
+
                                                *clipboard-providers-copy*
 The "copy" callback returns nothing and takes the following arguments in the
 following order:

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