Include wx/variant.h from wx/msw/ole/oleutils.h.

This ensures that this header is self-contained and can be included without
including wx/variant.h first.

Closes #16522.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77526 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove recursive "see also" link from GetAppDocumentsDir() docs.

This was probably supposed to be "@see GetDocumentsDir()", but as this
function is already mentioned, and auto-linked by Doxygen, just above, another
link to it is unnecessary, so remove it.

Closes #16520.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77527 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Mention that wxDialog::SetEscapeId() can't be used for native dialogs.

Native dialogs handling of Esc can't be customized (definitely not easily,
and possibly not at all).

See #16521.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77528 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775