doc: devicetree: clarify child node disabling

Add a note to status property that disabled parent nodes do not
implicitly disable child nodes.

Issue #82040

Signed-off-by: Andreas Rudolf <[email protected]>

Author: anrudolf

doc/build/dts/intro-syntax-structure.rst

@@ -288,6 +288,9 @@ status
     devices must be enabled for the corresponding ``struct device`` in the
     Zephyr driver model to be allocated and initialized.
 
+    Note that a child node is not implicitly disabled when its parent node is
+    disabled, i.e. child nodes should be disabled explicitly if desired.
+
 interrupts
     Information about interrupts generated by the device, encoded as an array
     of one or more *interrupt specifiers*. Each interrupt specifier has some