Adding this section ensures that the documentation generated by
mlir-tblgen for all the FIR operations are at the correct depth.
FIROperations are at depth 3, the new section is at depth 2. This fixes
the "Non-consecutive header level increase; H1 to H3" warning in
FIRLangRef.md.
Previously, FIRLangRef.md was incorrectly formatted.
This was due to how FIRLangRef.md had no page header,
and so the first entry would render incorrectly.
This patch introduces a header file, which is prepended to the FIRLangRef
before it becomes a HTML file. The header is currently brief
but can be expanded upon at a later date if required.
This formatting fix also means the index page
can correctly generate a link to FIRLangRef.html and as such,
this patch also removes FIRLangRef from the sidebar and adds it to the main list of links.
Depends on D128650
Reviewed By: kiranchandramohan
Differential Revision: https://reviews.llvm.org/D129186
