"adm" field of bid response URL-encoded in 2.2 Spec

[JackDunham]

In OpenRTB API Spec 2.2, the value of "adm" field is always shown as URL-encoded.
Example (p. 59):
"adm":"%3C!DOCTYPE%20html%20PUBLIC%20%5C%22-
%2F%2FW3C%2F%2FDTD%20XHTML%201.0%20Transitional%2F%2FEN%5C%22%20%5C%22htt
p%3A%2F%2Fwww.w3.org%2FTR%2Fxhtml1%2FDTD%2Fxhtml1-
transitional.dtd%5C%22%3E%3Chtml%20xmlns%3D%5C%22http%3A%2F%2Fwww.w3.org%2F1
999%2Fxhtml%5C%22%20xml%3Alang%3D%5C%22en%5C%22%20lang%3D%5C%22en%5C%22
%3E...%3C%2Fhtml%3E",