Improve rule suppression documentation

Existing documentation doesn't provide any information regarding rule-wise behavior of code suppression.

For example, PSSA cannot suppress PSAvoidUsingUserNameAndPassWordParams violations based on given rulesuppressionid.

    Configuration Foo
    {             
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingUserNameAndPassWordParams", "UserName", Scope="Function")]
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingUserNameAndPassWordPara", "EncryptedPassword", Scope="Function")]
        param (
            [Parameter(Mandatory)]
            [String]$UserName,

            [Parameter(Mandatory)]
            [String]$Password
        )

    }

该 issue 没有指定文档文件或测试。首先找到现有的规则抑制文档，并检查 PSSA 如何处理所示的 SuppressMessageAttribute 示例，包括 rulesuppressionid 值。完成的标准是：文档解释按规则进行抑制的行为，并涵盖 PSavoidUsingUserNameAndPassWordParams 示例。