runtime(tar): remove dependency on netrw#WinPath, include mapping doc

related: #17124

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/pi_tar.txt b/runtime/doc/pi_tar.txt
index 5b317d6..6d49928 100644
--- a/runtime/doc/pi_tar.txt
+++ b/runtime/doc/pi_tar.txt
@@ -1,4 +1,4 @@
-*pi_tar.txt*	For Vim version 9.1.  Last change: 2024 May 11
+*pi_tar.txt*	For Vim version 9.1.  Last change: 2025 Mar 16
 
 		       +====================+
 		       | Tar File Interface |
@@ -74,6 +74,15 @@
 	let g:loaded_tarPlugin= 1
 	let g:loaded_tar      = 1
 <
+							*tar-mappings*
+   MAPPINGS~
+
+   The following (buffer-local) mappings are available in a tar buffer:
+
+	<CR>		Open selected file for editing, any changes will be
+			written back to the archive.
+	<LeftMouse>	same as <CR>
+	x		Extract selected file.
 
 ==============================================================================
 3. Options						*tar-options*