Build the docs in realfull config

Ensure that all possible config options are documented by building the
docs in the realfull config on Read The Docs.

Signed-off-by: David Horstmann <david.horstmann@arm.com>

.readthedocs.yaml

@@ -12,7 +12,7 @@ build:
     python: "3.9"
   jobs:
     pre_build:
-      - make apidoc
+      - ./scripts/apidoc_full.sh
       - breathe-apidoc -o docs/api apidoc/xml
 
 # Build documentation in the docs/ directory with Sphinx