update plotly docs (added filter)

Author: Friedrich Völkers

docs/ref-plotly.md

@@ -38,18 +38,9 @@ traces:
 SimWrapper will read the file and insert the appropriate data columns into the configuration automatically. Note the `$` before the keyword that you used for identifying the dataset.
 
 - You can read _multiple datasets_ and refer to columns from each using `$key.column` for each.
-- A dataset can also be configured as an object (`file`, `filter`, `pivot`, `rename`, `normalize`, ...), not only as a simple file string.
 
 **Layout.** Layout is handled by SimWrapper automatically; however if you want to override some layout defaults, you can include a `layout` section. The contents will be merged with the default layout values.
 
-### Layout behavior updates
-
-- `layout.legend` from YAML is now merged with SimWrapper defaults (instead of replacing them).
-- Axis titles support both Plotly object syntax and legacy string syntax:
-  - `title: "Distance group"`
-  - `title: { text: "Distance group", standoff: 12 }`
-- If axis titles are present (`xaxis`, `yaxis`, `yaxis2`), margins are automatically enlarged to avoid clipped titles.
-
 ### Additional properties
 
 SimWrapper can preprocess datasets with the following special properties for use with the Plotly plug-in. Note, these are not part of the official Plotly library, but are SimWrapper-specific additions.