Here's the relevant section [1] (emphasis mine):

> “That is why I am inviting broadcasters to pledge to air programming in their local markets in support of this historic national, non-partisan celebration. As an example, this could include:

> • Running PSAs, short segments, or full specials specifically promoting _civic education, inspiring local stories, and American history_.

> • Including segments during regular news programming that highlight local sites that are significant to American and regional history, such as National Park Service sites.

> • Starting each broadcast day with the “Star Spangled Banner” or Pledge of Allegiance.

> • Airing music by America’s greatest composers, such as John Philip Sousa, Aaron Copland, Duke Ellington, or George Gershwin.

> • Providing daily “Today in American History” announcements highlighting significant events that took place on that day in history.

> • Partnering with community organizations and other groups that are already working hard to bring America’s stories of unity, perseverance, and triumph to light.

MLK's speeches are certainly included in civic education, inspiring local stories, and American history.

[1] https://docs.fcc.gov/public/attachments/DOC-418890A1.pdf