L2SDP-865: Rename FPGA_subband_spectral_inversion_R(W)

L2SDP-865: Rename FPGA_subband_spectral_inversion_R(W) -> FPGA_spectral_inversion_R(W) and make it configurable per input (instead of per FPGA)

tangostationcontrol/docs/source/devices/sdp.rst

@@ -44,9 +44,9 @@ To setup the input and output frequencies, the following attributes are offered:
 
   :type: ``uint32[N_fpgas][N_ants_per_fpga]``
 
-:FPGA_subband_spectral_inversion_RW: Whether to invert the spectrum, both within and across all subbands. This is required in odd-numbered NyQuist zones to have the signal increase in frequency over the subbands. This setting is automatically configured by setting `nyquist_zone_RW` but can be overwritten explicitly as well.
+:FPGA_spectral_inversion_RW: Whether to invert the spectrum, both within and across all subbands. This is required in odd-numbered NyQuist zones to have the signal increase in frequency over the subbands. This setting is automatically configured by setting `nyquist_zone_RW` but can be overwritten explicitly as well.
 
-  :type: ``bool[N_fpgas]``
+  :type: ``bool[N_fpgas][N_ants_per_fpga]``
 
 All of these are required to compute the actual frequencies of the subbands constructed by the PPF inside the FPGA. For convenience, the device explicitly exposes these: