Align max backlight level in docs (#8142)

docs/config_options.md

@@ -78,7 +78,7 @@ This is a C header file that is one of the first things included, and will persi
 * `#define BACKLIGHT_PIN B7`
   * pin of the backlight
 * `#define BACKLIGHT_LEVELS 3`
-  * number of levels your backlight will have (maximum 15 excluding off)
+  * number of levels your backlight will have (maximum 31 excluding off)
 * `#define BACKLIGHT_BREATHING`
   * enables backlight breathing
 * `#define BREATHING_PERIOD 6`

docs/ja/config_options.md

@@ -83,7 +83,7 @@ QMK での全ての利用可能な設定にはデフォルトがあります。
 * `#define BACKLIGHT_PIN B7`
    * バックライトのピン
 * `#define BACKLIGHT_LEVELS 3`
-   * バックライトのレベル数 (off を除いて最大15)
+   * バックライトのレベル数 (off を除いて最大31)
 * `#define BACKLIGHT_BREATHING`
    * バックライトのブレスを有効にします
 * `#define BREATHING_PERIOD 6`

docs/porting_your_keyboard_to_qmk_(arm_and_other_chibios_cpus).md

@@ -38,7 +38,7 @@ To configure a keyboard where each switch is connected to a separate pin and gro
 
 `BACKLIGHT_BREATHING` is a fancier backlight feature that adds breathing/pulsing/fading effects to the backlight. It uses the same timer as the normal backlight. These breathing effects must be called by code in your keymap.
 
-`BACKLIGHT_LEVELS` is how many levels exist for your backlight - max is 15, and they are computed automatically from this number.
+`BACKLIGHT_LEVELS` is how many levels exist for your backlight - max is 31, and they are computed automatically from this number.
 
 ## `/keyboards/<keyboard>/Makefile`