Documentation needs update for non-dictionary style overrides

[P4ntomime]

Problem Description

Per the example for styling, non-dictionary values for styles should override globally defined styles.
It appears as though the bug was introduced with version 0.4.2, as the behavior is still correct with version 0.4.1.
Edit: This has been changed in version 0.4.2 and the documentation should be updated to reflect this change.

Example

// Sets the stroke to red with a thickness of 5pt
set-style(stroke: (paint: red, thickness: 5pt))

// Draws a line with the global stroke
line((0,0), (1,0))

// Draws a blue line with a thickness of 5pt because dictionaries update the style
line((0,0), (1,1), stroke: (paint: blue))

// Draws a yellow line with a thickness of 1pt because other values override the style
line((0,0), (0,1), stroke: yellow)

The expected previous output should be

(produced with CeTZ version 0.4.1)

However, since version 0.4.2, the produced output is

[johannes-wolf]

The documentation needs an update. Stroke objects now merge with dictionaries instead of overwriting them. The current behavior is the expected one.