Fix lsfAMMNode docs

[mDuo13]

Fix #2728.

• Correct the description of this flag in the RippleState reference and put it into the correct order (the table is sorted by numeric value of the flags, ascending)
• Add proper amendment disclaimers for lsfAMMNode and the two DeepFreeze flags in the RippleState reference.
• Improve the whitespace alignment of the RippleState flags table (in the md source).
• Move the details of checking for lsfAMMNode flag from the AMMs concept page (where I felt that it was too much detail for that level) to the "Look Up Transaction Results" page (which is a much better fit for this type of thorough detail, although the rest of the page is slightly out of date) and linked there from the AMMs page.
• Updated some things for style in the areas around where I was already editing, like changing "Offer" to "offer" unless specifically talking about an Offer ledger entry, saying "ledger entry" instead of "ledger object", and referring to "trust line tokens" to distinguish from MPTs.