Doc: update porting guide
- `ZydisCPUFlagAction` got replaced by `ZydisAccessedFlagsMask`
- `ZydisAccessedFlags` was added as a replacement for the CPU flag arrays
- `ZYDIS_CPUFLAG_C[0-3]` were replaced with `ZYDIS_FPUFLAG_C[0-3]`
+- The segment API (`ZydisGetInstructionSegments` and corresponding types) was moved to a separate
+ header file
### Decoder
