Issue #2994319 by Ramya Balasubramanian, mohrerao, virajrajankar,...

Issue #2994319 by Ramya Balasubramanian, mohrerao, virajrajankar, benjamindamron, hardikpandya, kalyansamanta, jhodgdon, msankhala, jungle, kkalaskar, dhirendra.mishra, joachim, longwave, amateescu, mradcliffe, alexpott, jcnventura: EntityAutocomplete form element has no docs on how to use it

(cherry picked from commit 27b38859)