notcurses_plane.3: remove ncplane_styles()

doc/man/man3/notcurses_plane.3.md

@@ -82,7 +82,7 @@ notcurses_plane - operations on ncplanes
 
 **uint64_t ncplane_channels(const struct ncplane* n);**
 
-**uint32_t ncplane_attr(const struct ncplane* n);**
+**uint16_t ncplane_attr(const struct ncplane* n);**
 
 **void ncplane_set_channels(struct ncplane* nc, uint64_t channels);**
 
@@ -134,8 +134,6 @@ notcurses_plane - operations on ncplanes
 
 **void ncplane_styles_off(struct ncplane* n, unsigned stylebits);**
 
-**unsigned ncplane_styles(const struct ncplane* n);**
-
 **void ncplane_greyscale(struct ncplane* n);**
 
 **int ncplane_blit_bgrx(struct ncplane* nc, int placey, int placex, int linesize, ncblitter_e blitter, const unsigned char* data, int begy, int begx, int leny, int lenx);**