R. Kelly allegedly overdosed in prison and was rushed to the hospital last week. In court documents obtained by The Post, the rapper’s attorney, Beau B. Brindley, claimed that Bureau of Prisons staff at his federal center in Butner, North Carolina intentionally gave him too much medication, which caused him to overdose and be transferred to a nearby hospital. The lawyer alleged that Kelly was forced to take mediation in solitary confinement on the night of June 12. The next morning, Kelly allegedly felt “faint” and “dizzy” and “started to see black spots in his vision.” The rapper also allegedly...