Three obvious potential improvements stand out, besides the aforementioned grammatical issues:
The setup diagram is misleading; even though you clarify that the fore‐ and hindmost ranks are not actually part of the board, it's probably better to make that clear in the diagram too
Similarly, using pieces to denote destination squares in the movement diagrams is extremely(!) confusing. The diagram designer does provide for using coloured circles for this purpose; consider finding out how to use that functionality
The drop rule is not clear. You say that cannons and two soldiers start in hand and may be dropped only on resp^ly the 1^st or 3^rd rank, but even this information is easily missed and further details (is it Shōgi‐style drops? Seirawan‐style? Sth else entirely?) are completely unspecified. I'd suggest putting a note about it in the Rules section
Also a typo: your paragraph about the Soldier refers to droppable pawns.
Three obvious potential improvements stand out, besides the aforementioned grammatical issues:
Also a typo: your paragraph about the Soldier refers to droppable pawns.