doc(core): update reduce-repetitive-configuration.md (#22022)

Co-authored-by: Isaac Mann <isaacplmann@users.noreply.github.com>
Co-authored-by: Isaac Mann <isaacplmann@gmail.com>

docs/shared/recipes/running-tasks/reduce-repetitive-configuration.md

@@ -225,7 +225,9 @@ Now the `project.json` files can be reduced to this:
       "options": {
         "assets": ["libs/lib1/*.md", "libs/lib1/src/images/*"]
       }
-    }
+    },
+    "lint": {},
+    "test": {}
   },
   "tags": []
 }
@@ -241,6 +243,8 @@ Now the `project.json` files can be reduced to this:
   "sourceRoot": "libs/lib2/src",
   "projectType": "library",
   "targets": {
+    "build": {},
+    "lint": {},
     "test": {
       "options": {
         "testTimeout": 10000
@@ -261,6 +265,8 @@ Now the `project.json` files can be reduced to this:
   "sourceRoot": "libs/lib3/src",
   "projectType": "library",
   "targets": {
+    "build": {},
+    "lint": {},
     "test": {}
   },
   "tags": []