patch 9.1.0572: cannot specify tab page closing behaviour

Problem:  cannot specify tab page closing behaviour
          (Gianluca Pacchiella)
Solution: Add the 'tabclose' option (LemonBoy).

fixes: #5967
closes: #15204

Signed-off-by: LemonBoy <thatlemon@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 2dc08e2..5f1a2a0 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -8100,6 +8100,19 @@
 	'S' flag in 'cpoptions'.
 	Only normal file name characters can be used, "/\*?[|<>" are illegal.
 
+						*'tabclose'* *'tcl'*
+'tabclose' 'tcl'	string	(default "")
+			global
+	This option controls the behavior when closing tab pages (e.g., using
+	|:tabclose|).  When empty Vim goes to the next (right) tab page.
+
+	Possible values (comma-separated list):
+	   left		If included, go to the previous tab page instead of
+			the next one.
+	   uselast	If included, go to the previously used tab page if
+			possible.  This option takes precedence over the
+			others.
+
 						*'tabline'* *'tal'*
 'tabline' 'tal'		string	(default empty)
 			global