invoke.texi (-falign-functions): Document that when n is zero then a machine-dependen...

invoke.texi (-falign-functions): Document that when n is zero then a machine-dependent default is used.

	* doc/invoke.texi (-falign-functions): Document that
	when n is zero then a machine-dependent default is used.
	(-falign-labels): Document that when n is zero then a
	machine-dependent default is used and that -falign-labels =1
	is equivalent to -fno-align-labels.
	(-falign-loops): Likewise.
	(-falign-jumps): Likewise.

From-SVN: r69031