[doc] Update release_manager_guide.pod for mk_native_pbc
[doc] Update release_manager_guide.pod for mk_native_pbc

It is recommended to run pbc_header.pl --update-fingerprint, so that the
native_pbc tests will not be TODOd.
Remove the reference to the wrong tools/dev/mk_native_pbc.

FROGGS/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,FROGGS/parrot,parrot/parrot,FROGGS/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,parrot/parrot,youprofit/parrot,parrot/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,parrot/parrot,parrot/parrot,FROGGS/parrot,youprofit/parrot