docs(tutorial): fix tag for CSS files on tutorial

upgrade version of grunt-uidocs-generator

fix #6855

Author: Portugal, Marcelo

package-lock.json

@@ -56,7 +56,7 @@
     "grunt-newer": "^1.3.0",
     "grunt-protractor-runner": "^5.0.0",
     "grunt-shell-spawn": "~0.3.10",
-    "grunt-uidocs-generator": "^0.6.0",
+    "grunt-uidocs-generator": "^0.6.1",
     "hoek": "^5.0.3",
     "husky": "^0.14.3",
     "jasmine-core": "^2.4.1",