What is the meaning of "the verse of five sucklings," "Surat al-Khul‘," and "Surat al-Hafd," which Al-Shanqītī mentioned as examples of the Sunnah abrogating the Qur’an?

Scholars have differed on the issue of abrogation of the Qur’an by the Sunnah, but the verified position is the permissibility and occurrence of abrogating the Qur’an by the mutawatir (concurrently transmitted) Sunnah. Examples of this include: the abrogation of the verse of five sucklings, which was "ten known sucklings make unlawful," then abrogated by "five known ones," and the abrogation of Surahs al-Khal‘ and al-Hafd.