patch 8.2.3323: Vim9: Cannot use :silent with :endwhile

Problem:    Vim9: Cannot use :silent with :endwhile.
Solution:   Allow for using the :silent modifier. (closes #8737)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 4e258c5..05c06ec 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -4539,7 +4539,7 @@
 			Varname()->exists()
 <
 
-exists_compiled({expr})						*exists()*
+exists_compiled({expr})					*exists_compiled()*
 		Like `exists()` but evaluated at compile time.  This is useful
 		to skip a block where a function is used that would otherwise
 		give an error: >