ceil/ceiling/floor mathematical functions documented output is incorrect

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.5/functions-math.html
Description:

The ceil, ceiling, and floor mathematical functions in documentation
versions 9.5 through 12, and probably others is not correct.  The example
output shows the ceil* functions returning the integer below the float value
while the floor function shows the opposite.  Thanks!