docs: update shared example dependencies to Angular 7 and CLI 7 (#25892)

PR Close #25892

aio/tools/examples/shared/boilerplate/cli/src/karma.conf.js

@@ -16,13 +16,10 @@ module.exports = function (config) {
       clearContext: false // leave Jasmine Spec Runner output visible in browser
     },
     coverageIstanbulReporter: {
-      dir: require('path').join(__dirname, 'coverage'),
+      dir: require('path').join(__dirname, '../coverage'),
       reports: ['html', 'lcovonly'],
       fixWebpackSourcePaths: true
     },
-    angularCli: {
-      environment: 'dev'
-    },
     reporters: ['progress', 'kjhtml'],
     port: 9876,
     colors: true,
@@ -31,4 +28,4 @@ module.exports = function (config) {
     browsers: ['Chrome'],
     singleRun: false
   });
-};
+};