docs(helpers/open_graph): Fix incorrect default value and unintended rendering

[KentarouTakeda]

Check List

• Others (Update, fix, translation, etc...)
  • Languages:
  • en English
  • ru Russian
  • zh-cn simplified Chinese
  • zh-tw traditional Chinese
  • ja Japanese

Incorrect Default Value

The value blog specified as the default value for og:type is incorrect. As per the following implementation:

https://github.com/hexojs/hexo/blob/v7.1.1/lib/plugins/helper/open_graph.ts#L82

The default value is article or website depending on whether it is a post page or not.

Unintended Rendering

The default value of og:locale is chosen from several settings, as implemented below:

page.lang || page.language || config.language

Although this was written in the documentation, the | in this code was treated as a table separator, resulting in the display being cut off in the middle. I fixed it by escaping |.

Before fix:

After fix:

[github-actions]

Theme name validation passed.
Theme thumbnails validation completed.

[yoshinorin]

Thank you :)