Document setting rows in parameters column for text questions

[grzesiek2010]

XLSForm/pyxform#667

[jniles]

I looked into fixing this, and I believe the best place for it would be in this Google Sheet: https://docs.google.com/spreadsheets/d/e/2PACX-1vSTaRWo-0HZ7gSLkSbmdEhYrHau-pOiGXeI02hCOQtdul4WvrEugbM7hnIr33fyLLywlUDRImZxyV63/pubhtml?gid=970638218&single=true&widget=true&headers=false

However, I do not believe random people have edit access to that sheet. The fix would be to put "rows" in the parameters column of the row labeled "text".