update doc and nits

book/src/reference.md

@@ -15,6 +15,10 @@ on_failure = "bail"
 [preprocessor.admonish.default]
 collapsible = true
 
+[preprocessor.admonish.default.builtins_collapsible]
+summary = false
+warning = false
+
 [preprocessor.admonish.renderer.test]
 render_mode = "strip"
 ```
@@ -38,6 +42,7 @@ Subfields:
 
 - `default.title` (optional): Title to use for blocks. Defaults to the directive used in titlecase.
 - `default.collapsible` (optional, default: `false`): Make blocks collapsible by default when set to `true`.
+- `default.builtins_collapsible` (optional): Allows to make specific builtin directives collapsible when set to `true` (or to make them non-collapsible when set to `false`, overriding the value of `default.collapsible`)
 - `default.css_id_prefix` (optional, default: `"admonition-"`): The default css id prefix to add to the id of all blocks. Ignored on blocks with an `id` field.
 
 ### `renderer`
@@ -89,6 +94,7 @@ Add blocks using TOML's [Array of Tables](https://toml.io/en/v1.0.0#array-of-tab
 directive = "expensive"
 icon = "./money-bag.svg"
 color = "#24ab38"
+collapsible = true
 aliases = ["money", "cash", "budget"]
 ```
 
@@ -97,6 +103,7 @@ Subfields:
 - `directive`: The keyword to use this type of block.
 - `icon`: A filepath relative to the book root to load an SVG icon from.
 - `color`: An RGB hex encoded color to use for the icon.
+- `collapsible` (optional): The default boolean value of the collapsible property for this type of block.
 - `aliases` (optional): One or more alternative directives to use this block.
 - `title` (optional): The default title for this type of block. If not specified, defaults to the directive in title case. To give each alias a custom title, add multiple custom blocks.
 

src/resolve.rs

@@ -344,7 +344,7 @@ mod test {
     }
 
     #[test]
-    fn test_admonition_info_from_raw_with_custom_directive_and_collapsible() {
+    fn test_admonition_info_from_raw_with_collapsible_custom_directive() {
         assert_eq!(
             AdmonitionMeta::resolve(
                 InstanceConfig {