Make 'Advanced' Tutorials more consistent

[lisahaxel]

Notebook checklist:

• [ ] One sentence description
  • At README
  • At top of notebook
• [ ] Make note about SNPE single round = NPE only in Examples
• [ ] Fix Imports
• [ ] Replace simple interface with flexible interface
• [ ] Check that only one simulator is defined
• [ ] Descriptions and code about the same thing should be consistent
• [ ] Simulator description
• [ ] Pass parameter names in pairplot
• [ ] For non-code related things (e.g., observations remove) ``
• [ ] Remove Typos
• [ ] Improve formulations (should be clear and concise)