docs: add missing pages to root toctree

Sphinx (warnings-as-errors) failed because
docs/s_core_v_1/index.rst and docs/verification_report/platform_verification_report.rst
were referenced via grid-cards but not listed in any toctree.

Author: antonkri

docs/index.rst

@@ -76,4 +76,6 @@ documentation set that downstream product distributions can build on.
    sw_components
    integration_process/integration_process
    process_methods_tools
+   s_core_v_1/index
    s_core_v_1/releases/releases
+   verification_report/platform_verification_report