Fix typos in example monorepo documentation. (#4164)

Author: bradfordlemley

packages/react-scripts/template/README.md

@@ -1874,14 +1874,24 @@ monorepo/
     "private": true
   app1/
     package.json:
-      "dependencies": ["@myorg/comp1": ">=0.0.0", "react": "^16.2.0"],
-      "devDependencies": ["react-scripts": "2.0.0"]
+      "dependencies": {
+        "@myorg/comp1": ">=0.0.0",
+        "react": "^16.2.0"
+      },
+      "devDependencies": {
+        "react-scripts": "2.0.0"
+      }
     src/
       app.js: import comp1 from '@myorg/comp1';
   app2/
     package.json:
-      "dependencies": ["@myorg/comp1": ">=0.0.0", "react": "^16.2.0"],
-      "devDependencies": ["react-scripts": "2.0.0"]
+      "dependencies": {
+        "@myorg/comp1": ">=0.0.0",
+        "react": "^16.2.0"
+      },
+      "devDependencies": {
+        "react-scripts": "2.0.0"
+      }
     src/
       app.js: import comp1 from '@myorg/comp1';
   comp1/
@@ -1893,8 +1903,12 @@ monorepo/
     package.json:
       "name": "@myorg/comp2",
       "version": "0.1.0",
-      "dependencies": ["@myorg/comp1": ">=0.0.0"],
-      "devDependencies": ["react": "^16.2.0"]
+      "dependencies": {
+        "@myorg/comp1": ">=0.0.0"
+      },
+      "devDependencies": {
+        "react": "^16.2.0"
+      }
     index.js: import comp1 from '@myorg/comp1'
 ```
 * Monorepo tools work on a package level, the same level as an npm package.