SDL: document the purpose of SDL_SetTextInputRect (be0e3)

From be0e303ec819236eff4823536251e16dc32ba3af Mon Sep 17 00:00:00 2001
From: shenleban tongying <[EMAIL REDACTED]>
Date: Tue, 28 Nov 2023 15:00:04 -0500
Subject: [PATCH] document the purpose of SDL_SetTextInputRect

(cherry picked from commit 3e6513c77390969cd870726690bf89e39fe91e60)
---
 include/SDL_keyboard.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/SDL_keyboard.h b/include/SDL_keyboard.h
index 86a37ad1a241..413464ae2132 100644
--- a/include/SDL_keyboard.h
+++ b/include/SDL_keyboard.h
@@ -298,8 +298,10 @@ extern DECLSPEC void SDLCALL SDL_ClearComposition(void);
 extern DECLSPEC SDL_bool SDLCALL SDL_IsTextInputShown(void);
 
 /**
- * Set the rectangle used to type Unicode text inputs.
- *
+ * Set the rectangle used to type Unicode text inputs. Native input methods
+ * will place a window with word suggestions near it, without covering the
+ * text being inputted.
+ * 
  * To start text input in a given location, this function is intended to be
  * called before SDL_StartTextInput, although some platforms support moving
  * the rectangle even while text input (and a composition) is active.