[gamma.util] fixed incorrect command names and modules; improved docs
[gamma.util] fixed incorrect command names and modules; improved docs

- par_EORC_PALSAR_geo and par_TX_geo are part of module diff, not isp
- renamed S1_deramp_S1_TOPS to SLC_deramp_S1_TOPS
- correctOSV: added docs for missing par osvType, added See Also section

johntruckenbrodt/pyroSAR,johntruckenbrodt/pyroSAR