Fix Doc Typo in Flowsheet List

[MarcusHolly]

Summary/Motivation:

"Implementation" was showing up in the flowsheet list because it had the wrong section heading syntax in the LSRRO flowsheet documentation. See the before and after pictures below

Old

New

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[adam-a-a]

@MarcusHolly I can't see the "new" snapshot but trust that you made the revision.

[MarcusHolly]

@MarcusHolly I can't see the "new" snapshot but trust that you made the revision.

I forgot to add it lol. Just did it now