doc: remove duplicated code.
doc: remove duplicated code.

remove duplicated code and tweak LT() example
foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,TanayParikh/foam2,TanayParikh/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,foam-framework/foam2,TanayParikh/foam2,TanayParikh/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2