Update text on embright

Based on coversations with @deep.chatterjee the text when discussing em bright needs to be update to better describe the current method:

The classification of the GW signal, in order of descending
probability, is BNS (95%), Terrestrial (4%), NSBH (1%), or BBH (<1%).
Assuming the candidate is astrophysical in origin, the probability
that the lighter compact object has a mass < 3 solar masses (HasNS) is
>99%. [6] Using the masses and spins inferred from the signal, the
probability of matter outside the final compact object (HasRemnant) is
>99%. [6]