Add ibyte to Fifo_Signal_Source documentation

_sp-blocks/02-signal-source.md

@@ -611,7 +611,7 @@ This implementation accepts the following parameters:
 |  --------------  |
 | `implementation` | `Fifo_Signal_Source`                                                                                                                                                                                                                                                                   |  Mandatory   |
 |    `filename`    | Name of the fifo stream from which samples will be read.                                                                                                                                                                                                                               |  Mandatory   |
-|  `sample_type`   | [`ishort`, `gr_complex`]: Sample type in fifo stream. It defaults to `ishort`. The output of this block is always `gr_complex`.                                                                                                                                                        |   Optional   |
+|  `sample_type`   | [`ibyte`, `ishort`, `gr_complex`]: Sample type in fifo stream. It defaults to `ishort`. The output of this block is always `gr_complex`.                                                                                                                                                        |   Optional   |
 |      `dump`      | [`true`, `false`]: If set to `true`, it dumps the content of the source file `filename` in <abbr id="data-type" title="Complex samples with real and imaginary parts of type 32-bit floating point. C++ name: std::complex<float>">`gr_complex`</abbr> format. It defaults to `false`. |   Optional   |
 | `dump_filename`  | If `dump` is set to `true`, the name of the dump file. It defaults to `./data/signal_source.dat`                                                                                                                                                                                       |   Optional   |
 |     -------      |