[rfa/doc] Do not use formal parameters named "current_gdbarch" in the docs

[Eli Zaretskii]

> Date: Thu, 4 Jun 2009 14:38:33 +0200 (CEST)
> From: "Ulrich Weigand" <uweigand@de.ibm.com>
> 
> OK to apply?
> 
> Bye,
> Ulrich
> 
> 
> ChangeLog:
> 
> 	* gdbint.texinfo: Rename formal parameters to gdbarch function
> 	protoypes from "current_gdbarch" to "gdbarch".

Yes, thanks.