cursor-type doc fix

* src/buffer.c (syms_of_buffer): Mention that cursor-type's
WIDHT/HEIGHT can't exceed the frame char size (bug#19215).

(cherry picked from commit 77c5f4554ebb3b7c7d49bc881e45a550f6c93987)

1 files changed, 2 insertions, 0 deletions

diff --git a/src/buffer.c b/src/buffer.c
index f06d7e08e49..e4269c0046a 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -6233,6 +6233,8 @@ Values are interpreted as follows:
   (hbar . HEIGHT) display a horizontal bar cursor with height HEIGHT
   ANYTHING ELSE   display a hollow box cursor
 
+WIDTH and HEIGHT can't exceed the frame's canonical character size.
+
 When the buffer is displayed in a non-selected window, the
 cursor's appearance is instead controlled by the variable
 `cursor-in-non-selected-windows'.  */);