add text into layout placeholder

phl_with_text(x, olay, id, str, type = "title", ...)

Arguments

x	rpptx object
olay	an OfficerLayout object created using `phl_layout`
id	an single integer with an id of the placeholder from `olay` object.
str	text to add.
type	type of the text placeholder. See `ph_add_text` for more details.
...	other arguments passed to `ph_add_text`.