fix(typo): fix two typos in config (#615)

change words "form" to "from"

_config.template.yml

@@ -233,8 +233,8 @@ sidebar:
 # Comment Systems
 # Available value of "use":
 #     disqus | disqus_click | changyan | livere | gitment | gitalk | valine | wildfire
-# If you want to use gitment or gitalk,you should get the client_id and client_secret form https://github.com/settings/applications/new
-# If you want to use valine,you should get the app_id and app_key form https://leancloud.cn ,more setting please see https://valine.js.org
+# If you want to use gitment or gitalk,you should get the client_id and client_secret from https://github.com/settings/applications/new
+# If you want to use valine,you should get the app_id and app_key from https://leancloud.cn ,more setting please see https://valine.js.org
 comment:
     use:
     shortname: # duoshuo or disqus shortname