docs: Add missing error responses (401, 422) to folder endpoints

Add 401 Unauthorized to Create, Retrieve, Update, Delete folder endpoints.
Add 422 Validation error to Update folder endpoint.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sametozcan

descriptions/0/api.intercom.io.yaml

@@ -2778,6 +2778,12 @@ paths:
                 updated_at: 1672928359
               schema:
                 "$ref": "#/components/schemas/folder"
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error"
         '422':
           description: Validation error
           content:
@@ -2819,6 +2825,12 @@ paths:
                 updated_at: 1672928610
               schema:
                 "$ref": "#/components/schemas/folder"
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error"
         '404':
           description: Folder not found
           content:
@@ -2891,12 +2903,24 @@ paths:
                 updated_at: 1672928900
               schema:
                 "$ref": "#/components/schemas/folder"
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error"
         '404':
           description: Folder not found
           content:
             application/json:
               schema:
                 "$ref": "#/components/schemas/error"
+        '422':
+          description: Validation error
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error"
     delete:
       summary: Delete a folder
       parameters:
@@ -2926,6 +2950,12 @@ paths:
                 deleted: true
               schema:
                 "$ref": "#/components/schemas/deleted_folder_object"
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error"
         '404':
           description: Folder not found
           content: