"chuck section" in markdown doesn't remove the trailing lines

[Cedric Halbronn]

with this markdown text originally:

# hello

this is a text

# title 2

this is another text

saying chuck section row one, we get:

# title 2

this is another text

notice the 2 spaces above title 2. NOTE: the same result happens when saying change section row one.

saying chuck section row one, I would expect it to delete the trailing lines, similarly to deleting a function on some language like Python

# title 2

this is another text

[Pokey Rule]

Can't decide whether this one warrants its own issue. See #855 (comment)