build: always CI build documentation

The documentation is generated from the source code files (*.[ch]), thus
we should build by any source code change not just if something changes
in the doc directory.

Signed-off-by: Daniel Wagner <[email protected]>

Author: dwsuse

.github/workflows/docs.yaml

@@ -4,12 +4,8 @@ name: docs
 on:
   push:
     branches: [master]
-    paths:
-      - doc/**
   pull_request:
     branches: [master]
-    paths:
-      - doc/**
 
   workflow_dispatch: