[Minor] Some typos I found in the paper and the docs

[niksirbi]

Paper

• Line 24: dislay
• Line 31: snub.io.add_splikeplot

Docs

• Homepage: snub.io.add_splikeplot
• Calcium imaging tutorial: There are also a behavior annotations (the "a" should be removed).

[calebweinreb]

Wow thank you for catching these! Fixed here https://github.com/calebweinreb/SNUB/commit/389dde73608ff707c720cb2e053fc66d789083d6