doc: assign ids to many headings

without stable ids on headings we cannot generate stable links to these
headings. nrd complains about this, but the current docbook workflow
does not.

a few generated ids remain, mostly in examples and footnotes. most of
the examples are generated by nixdoc (which has since gained MD export
functions, and the MD export does generate IDs).

1 files changed, 3 insertions, 3 deletions

diff --git a/doc/languages-frameworks/chicken.section.md b/doc/languages-frameworks/chicken.section.md
index d8c35bd20c506..d329943dc3c24 100644
--- a/doc/languages-frameworks/chicken.section.md
+++ b/doc/languages-frameworks/chicken.section.md
@@ -4,7 +4,7 @@
 [R⁵RS](https://schemers.org/Documents/Standards/R5RS/HTML/)-compliant Scheme
 compiler. It includes an interactive mode and a custom package format, "eggs".
 
-## Using Eggs
+## Using Eggs {#sec-chicken-using}
 
 Eggs described in nixpkgs are available inside the
 `chickenPackages.chickenEggs` attrset. Including an egg as a build input is
@@ -22,7 +22,7 @@ might write:
 Both `chicken` and its eggs have a setup hook which configures the environment
 variables `CHICKEN_INCLUDE_PATH` and `CHICKEN_REPOSITORY_PATH`.
 
-## Updating Eggs
+## Updating Eggs {#sec-chicken-updating-eggs}
 
 nixpkgs only knows about a subset of all published eggs. It uses
 [egg2nix](https://github.com/the-kenny/egg2nix) to generate a
@@ -36,7 +36,7 @@ $ cd pkgs/development/compilers/chicken/5/
 $ egg2nix eggs.scm > eggs.nix
 ```
 
-## Adding Eggs
+## Adding Eggs {#sec-chicken-adding-eggs}
 
 When we run `egg2nix`, we obtain one collection of eggs with
 mutually-compatible versions. This means that when we add new eggs, we may