int_*() functions require rsample objects, not just data frames

[hfrick]

The int_*() used to work with data frames, this changed with #435 where we turned them into methods for bootstraps objects. Let's update the documentation to reflect that and update/remove these tests.

rsample/tests/testthat/_snaps/bootci.md

Lines 152 to 172 in bdf12e1

	Code
	int_pctl(as.data.frame(bt_norm), stats)
	Condition
	Error in `UseMethod()`:
	! no applicable method for 'int_pctl' applied to an object of class "data.frame"
	---
	Code
	int_t(as.data.frame(bt_norm), stats)
	Condition
	Error in `UseMethod()`:
	! no applicable method for 'int_t' applied to an object of class "data.frame"
	---
	Code
	int_bca(as.data.frame(bt_norm), stats, .fn = get_stats)
	Condition
	Error in `UseMethod()`:
	! no applicable method for 'int_bca' applied to an object of class "data.frame"

[hfrick]

These also need updating or removal:

rsample/tests/testthat/_snaps/bootci.md

Lines 176 to 188 in bdf12e1

	Code
	int_t(bt_norm %>% dplyr::filter(id != "Apparent"), stats)
	Condition
	Error in `UseMethod()`:
	! no applicable method for 'int_t' applied to an object of class "c('tbl_df', 'tbl', 'data.frame')"
	---
	Code
	int_bca(bt_norm %>% dplyr::filter(id != "Apparent"), stats, .fn = get_stats)
	Condition
	Error in `UseMethod()`:
	! no applicable method for 'int_bca' applied to an object of class "c('tbl_df', 'tbl', 'data.frame')"