a few broken tags in changelog 3.5.0

for example

<img width="738" alt="Screen Shot 2019-10-23 at 6 03 21 PM" src="https://user-images.githubusercontent.com/2212006/67437700-79a62100-f5bf-11e9-9d21-83b5d7945080.png">

uses invalid markup (see unbalanced `"`)

```
- {% url "`.dblclick()` dblclick %} now accepts `position`, `x`, and `y` arguments. Addresses {% issue 116 %}.
```