Restructure foreign data wrapper chapter so it has more than one section.

As noted by Laurenz Albe, our SGML tools deal rather oddly with chapters
having just one <sect1>.  Perhaps the tooling could be fixed, but really
the design of this chapter's introduction is pretty bogus anyhow.  Split
it into a true introduction and a <sect1> about the FDW functions, so
that it reads better and dodges the lack-of-a-chapter-TOC problem.

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