Match nav bar to section headings

Author: mborland

doc/modules/ROOT/nav.adoc

@@ -1,8 +1,8 @@
 * xref:overview.adoc[]
 * xref:basics.adoc[]
 * xref:examples.adoc[]
-** xref:examples.adoc#examples_construction[Construction]
-** xref:examples.adoc#examples_promotion[Type Promotion]
+** xref:examples.adoc#examples_construction[Basic Construction]
+** xref:examples.adoc#examples_promotion[Promotion and Mixed Decimal Arithmetic]
 ** xref:examples.adoc#examples_charconv[`<charconv>`]
 ** xref:examples.adoc#examples_generic_programming[Generic Programming]
 ** xref:examples.adoc#examples_literals_constants[Literals and Constants]