nixos/manual: remove .unnumbered section attributes

pandoc would drop these when converting to docbook, just like it dropped
.title block classes.

1 files changed, 4 insertions, 4 deletions

diff --git a/nixos/doc/manual/development/option-def.section.md b/nixos/doc/manual/development/option-def.section.md
index 22cf38873cf..6a3dc26b99b 100644
--- a/nixos/doc/manual/development/option-def.section.md
+++ b/nixos/doc/manual/development/option-def.section.md
@@ -12,7 +12,7 @@ config = {
 However, sometimes you need to wrap an option definition or set of
 option definitions in a *property* to achieve certain effects:
 
-## Delaying Conditionals {#sec-option-definitions-delaying-conditionals .unnumbered}
+## Delaying Conditionals {#sec-option-definitions-delaying-conditionals}
 
 If a set of option definitions is conditional on the value of another
 option, you may need to use `mkIf`. Consider, for instance:
@@ -56,7 +56,7 @@ config = {
 };
 ```
 
-## Setting Priorities {#sec-option-definitions-setting-priorities .unnumbered}
+## Setting Priorities {#sec-option-definitions-setting-priorities}
 
 A module can override the definitions of an option in other modules by
 setting an *override priority*. All option definitions that do not have the lowest
@@ -72,7 +72,7 @@ This definition causes all other definitions with priorities above 10 to
 be discarded. The function `mkForce` is equal to `mkOverride 50`, and
 `mkDefault` is equal to `mkOverride 1000`.
 
-## Ordering Definitions {#sec-option-definitions-ordering .unnumbered}
+## Ordering Definitions {#sec-option-definitions-ordering}
 
 It is also possible to influence the order in which the definitions for an option are
 merged by setting an *order priority* with `mkOrder`. The default order priority is 1000.
@@ -89,7 +89,7 @@ definitions in the final list value of `hardware.firmware`.
 Note that this is different from [override priorities](#sec-option-definitions-setting-priorities):
 setting an order does not affect whether the definition is included or not.
 
-## Merging Configurations {#sec-option-definitions-merging .unnumbered}
+## Merging Configurations {#sec-option-definitions-merging}
 
 In conjunction with `mkIf`, it is sometimes useful for a module to
 return multiple sets of option definitions, to be merged together as if