Comment about dynamic members for the DotNetAdapter 'GetMember' and 'GetMembers' - #7087

PR Summary

DotNetAdapter.GetMembers<T>(object obj) returns dynamic members for an object that implements IDynamicMetaObjectProvider, however, DotNetAdapter.GetMember<T>(object obj, string memberName) doesn't include dynamic members. I believe this makes sense and thus update the comment to clarify it in the code.

Be noted that, GetMember<T>(object obj, string memberName) doesn't return Event members either, while GetMembers<T>(object obj) does.

Background

The question about this was raised in #6898 (comment). After investigation, I found it's because DotNetAdapter.GetMember<T>(object obj, string memberName) doesn't return dynamic members, and thus submit this PR to call it out in the code comments.

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