Commit f17630ba75
("doc: application: added description of WARN_EXPERIMENTAL setting")
introduced a new section in the Kconfig settings bit about
experimental features.
This broke the structure of the document, however, because it used the
wrong kind of section underline, resulting in a hierarchy that looks
like this:
Application Configuration
└── Kconfig Configuration
Experimental Features
└── Devicetree Overlays
when it should have looked like this:
Application Configuration
├── Kconfig Configuration
| └── Experimental Features
└── Devicetree Overlays
This falsely make it look like DT overlays are an experimental
feature!
Fix it.
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>