[WIP] Cookbook grammar and style fixes

This is a follow-up for #4679 

It Fixes some general issues in grammar, style and readability.

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | >= 2.3
| Fixed tickets | 
while this isn't your fault I want to note that we always try to avoid first person usage. Can we remove "Let's" here completely by rewriting this sentence?