Inaccurate description of pathPattern configuration

[JohnNiang]

In the PR #6, we have supported image zooming based on page rules, but the description of pathPattern below is not accurate.

用于匹配页面路径的正则表达式，如：/archives/**

On the contrary, the rule is based on PathPattern instead of Regex. Thereforce, I request a clearer description of the configuration.

/kind improvement