Documentation/printf: Use literal fwnode_handle

When looking for fwnode_handle in the printk format documentation, it is
only found in the Chinese translation:

$ git grep fwnode_handle -- Documentation/*printk-formats.rst
Documentation/translations/zh_CN/core-api/printk-formats.rst:用于打印fwnode_handles的消息。默认情况下是打印完整的节点名称，包括路径。

This happens because the original documentation talks about "fwnode
handles", without mentioning the actual type name.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Tested-by: Kunwu Chan <[e-mail]>
Reviewed-by: Kunwu Chan <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Reviewed-by: Sakari Ailus <[e-mail]>
Fixes: 3bd32d6a2ee62db3 ("lib/vsprintf: Add %pfw conversion specifier for printing fwnode names")
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/07262[e-mail]

Documentation/core-api/printk-formats.rst

···
 
 	%pfw[fP]
 
-For printing information on fwnode handles. The default is to print the full
+For printing information on an fwnode_handle. The default is to print the full
 node name, including the path. The modifiers are functionally equivalent to
 %pOF above.