[doc] Change FI compilation target names

As in the OpenTitan repository the compilation target names for the
pentest binaries changes, this commit adapts them accordingly.

Signed-off-by: Pascal Nasahl <nasahlpa@lowrisc.org>

Author: nasahlpa

doc/building_fpga_bitstreams_binaries.md

@@ -57,8 +57,9 @@ The following table gives an overview of the different binary configurations:
 | HMAC SCA        | ot-sca_cw310       | sca_ujson_fpga_cw310.bin      | pen_test_sca_fpga_cw310_test_rom         |
 | SHA3 SCA        | ot-sca_cw310_kmac  | sca_kmac_ujson_fpga_cw310.bin | pen_test_sca_fpga_cw310_test_rom         |
 | Ibex SCA        | ot-sca_cw310       | sca_ujson_fpga_cw310.bin      | pen_test_sca_fpga_cw310_test_rom         |
-| FI              | ot-sca_cw310       | fi_ujson_fpga_cw310.bin       | fpga_pentest_fi_fpga_cw310_test_rom      |
-| FI OTBN         | ot-sca_cw310       | fi_otbn_ujson_fpga_cw310.bin  | fpga_pentest_fi_otbn_fpga_cw310_test_rom |
+| FI              | ot-sca_cw310       | fi_ujson_fpga_cw310.bin       | pen_test_fi_fpga_cw310_test_rom          |
+| FI Ibex         | ot-sca_cw310       | fi_ibex_ujson_fpga_cw310.bin  | pen_test_fi_ibex_fpga_cw310_test_rom     |
+| FI OTBN         | ot-sca_cw310       | fi_otbn_ujson_fpga_cw310.bin  | pen_test_fi_otbn_fpga_cw310_test_rom     |
 
 ### Build Instructions