* gdb.texinfo (Specify Location): New section.

	* gdb.texinfo (Specify Location): New section.
	(Delete Breaks, Edit, Set Breaks): Remove description of
	locations.  Instead, add a reference to "Specify Location".
	(Machine Code, Jumping, Thread Stops, Continuing and Stepping)
	(Symbols): Refer to "Specify Location" for the valid forms of
	linespecs and locations.