docs: update changelog docs and schema

Signed-off-by: Carlos A Becker <caarlos0@users.noreply.github.com>

www/docs/customization/changelog.md

@@ -64,6 +64,27 @@ changelog:
       order: 1
     - title: Others
       order: 999
+      # A group can have subgroups.
+      # If you use this, all the commits that match the parent group will also
+      # be checked against its subgroups. If some of them matches, it'll be
+      # grouped there, otherwise they'll remain ungrouped.
+      #
+      # The title is optional - you can think of groups as a way to order
+      # commits within a group.
+      #
+      # There can only be one level of subgroups, i.e. a subgroup cannot have
+      # subgroups.
+      #
+      # This feature is only available in GoReleaser Pro.
+      #
+      # Since: v1.15.0-pro
+      subgroups:
+        - title: 'Docs'
+          regex: '.*docs.*'
+          order: 1
+        - title: 'CI'
+          regex: '.*build.*'
+          order: 2
 
   filters:
     # Commit messages matching the regexp listed here will be removed from

www/docs/pro.md

@@ -5,7 +5,8 @@ additional features:
 
 - [x] [Split and merge builds](/customization/partial) to speed up your release
   by splitting work, use CGO, or run platform-specific code;
-- [x] [Filter commits by path in the changelog](/customization/changelog);
+- [x] More [changelog options](/customization/changelog): Filter commits by path
+  & sub-groups;
 - [x] Have custom [before and after hooks for archives](/customization/archive/);
 - [x] Prepare a release with
   [`goreleaser release --prepare`](/cmd/goreleaser_release/), publish and

www/docs/static/schema-pro.json

@@ -474,21 +474,6 @@
 				"additionalProperties": false,
 				"type": "object"
 			},
-			"ChangeLogGroup": {
-				"properties": {
-					"title": {
-						"type": "string"
-					},
-					"regexp": {
-						"type": "string"
-					},
-					"order": {
-						"type": "integer"
-					}
-				},
-				"additionalProperties": false,
-				"type": "object"
-			},
 			"Changelog": {
 				"properties": {
 					"filters": {
@@ -518,7 +503,7 @@
 					},
 					"groups": {
 						"items": {
-							"$ref": "#/$defs/ChangeLogGroup"
+							"$ref": "#/$defs/ChangelogGroup"
 						},
 						"type": "array"
 					},
@@ -535,6 +520,42 @@
 				"additionalProperties": false,
 				"type": "object"
 			},
+			"ChangelogGroup": {
+				"properties": {
+					"title": {
+						"type": "string"
+					},
+					"regexp": {
+						"type": "string"
+					},
+					"order": {
+						"type": "integer"
+					},
+					"groups": {
+						"items": {
+							"$ref": "#/$defs/ChangelogSubgroup"
+						},
+						"type": "array"
+					}
+				},
+				"additionalProperties": false,
+				"type": "object"
+			},
+			"ChangelogSubgroup": {
+				"properties": {
+					"title": {
+						"type": "string"
+					},
+					"regexp": {
+						"type": "string"
+					},
+					"order": {
+						"type": "integer"
+					}
+				},
+				"additionalProperties": false,
+				"type": "object"
+			},
 			"Checksum": {
 				"properties": {
 					"name_template": {