@notebook should convert separate strings into one markdown string

[OAGr]

• x Is new feature

  Description of suggestion or shortcoming:

When an array is shwon as a notebook, the strings should be compressed. So, a notebook like,

@notebook
foo = [
"- point 1",
"- point 2"
]

Would look just like,

@notebook
foo = [
"- point 1
- point 2"
]

Right now, each separate string gets a lot of separate spacing.