feat(LDPCImplementation.md): Fix documentation

beurdoucrequested to merge
fix_LDPCImplementation into develop

Few ambiguities and outdated names were found in the LDPC documentation by Vlademir Brusse (see in the devel mailing list).

  • Outdated names of the functions of the segment coding interface.
  • Ambiguity about loading of the segment coding libraries.

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