When viewing the Polybrush samples in Package Manager, one of the samples is called:

Shader Examples (LWRP)

This sample contains Shaders that also have LWRP in their names.

The shaders and the name of the sample package should be updated to Universal RP as that is now the focus over LWRP.

1. Open Unity
2. Open the attached project
3. In project view, go to Assets > Samples > Polybrush > 1.0.0
4. Inspect the contents of the samples

Expected Result:
The samples reference Universal RP.

Actual Result:
The samples reference LWRP.

Tested on Windows.

Occurs on Polybrush 1.0.0 with 2019.3.0, 2020.1.0