The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/14/catalog-pg-proc.html
Description:
I don't know if this is a documentation problem or an error in pg_proc.
The document, for the "prokind" column state the following:
f for a normal function, p for a procedure, a for an aggregate
function, or w for a window function.
However, there "f" is used for *both* functions and procedures.