sw: document SwFootnoteFrame

Similar to the doc model, "footnote" actually means "footnote or
endnote" in practice.

Change-Id: I89a38ed91bbfb2e1948b5f4393d4929ecfd20e0e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/146594
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
diff --git a/sw/source/core/inc/ftnfrm.hxx b/sw/source/core/inc/ftnfrm.hxx
index 1d56901..a6835c9 100644
--- a/sw/source/core/inc/ftnfrm.hxx
+++ b/sw/source/core/inc/ftnfrm.hxx
@@ -76,6 +76,8 @@ inline SwFootnoteFrame* SwFootnoteContFrame::PrependChained(SwFrame* pThis, bool
    return AddChained(false, pThis, bDefaultFormat);
}

/// Represents one footnote or endnote in the layout. Typical upper is an SwFootnoteContFrame,
/// typical lower is an SwTextFrame.
class SwFootnoteFrame final : public SwLayoutFrame
{
    // Pointer to FootnoteFrame in which the footnote will be continued: