patch 8.2.1401: cannot jump to the last used tabpage

Problem:    Cannot jump to the last used tabpage.
Solution:   Add g<Tab> and tabpagnr('#'). (Yegappan Lakshmanan, closes #6661,
            neovim #11626)
diff --git a/runtime/doc/tabpage.txt b/runtime/doc/tabpage.txt
index 75070b5..1d8c208 100644
--- a/runtime/doc/tabpage.txt
+++ b/runtime/doc/tabpage.txt
@@ -221,6 +221,8 @@
 							*:tabl* *:tablast*
 :tabl[ast]	Go to the last tab page.
 
+					    *g<Tab>* *CTRL-W_g<Tab>* *<C-Tab>*
+g<Tab>		Go to the last accessed tab page.
 
 Other commands:
 							*:tabs*