INVALID_INTRODUCTION_SECTION_CHILD forgets nested <section> elements #248
Description
Description
Similar to issue #249 and #251
Error
└- Code - INVALID_SECURITY_CONSIDERATIONS_SECTION_CHILD
└- Desc - The introduction section must consist of <artwork>, <aside>, <blockquote>, <dl>, <figure>, <iref>, <ol>, <sourcecode>, <t>, <table>, <texttable>, <ul> elements only.
└- Ref - https://www.rfc-editor.org/rfc/rfc7991.html#section-2.46
But (3) in https://www.rfc-editor.org/rfc/rfc7991.html#section-2.46 says:
3. Optional <section> elements ([Section 2.46](https://www.rfc-editor.org/rfc/rfc7991.html#section-2.46))