notcurses_render: explicit pile rules #1078

doc/man/man3/notcurses_render.3.md

@@ -28,10 +28,8 @@ render (see notcurses_stats(3)), and screen geometry is refreshed (similarly to
 **notcurses_refresh**) *following* the render.
 
 While **notcurses_render** is called, you **must not call any other functions
-modifying the same notcurses context**, with the exceptions of:
-
-* **notcurses_getc** (and its input-related helpers; see **notcurses_input(3)**)
-* Functions operating only on off-stack **ncplane**s
+modifying the same pile**. Other piles may be freely accessed and modified.
+The pile being rendered may be accessed, but not modified.
 
 **notcurses_render_to_buffer** performs the render and raster processes of
 **notcurses_render**, but does not write the resulting buffer to the