[Docs] RGB documentation formatting corrections (#15826)

docs/feature_rgb_matrix.md

@@ -418,6 +418,8 @@ All RGB keycodes are currently shared with the RGBLIGHT system:
 `RGB_MODE_PLAIN`, `RGB_MODE_BREATHE`, `RGB_MODE_RAINBOW`, and `RGB_MODE_SWIRL` are the only ones that are mapped properly. The rest don't have a direct equivalent, and are not mapped.
 
 ?> `RGB_*` keycodes cannot be used with functions like `tap_code16(RGB_HUD)` as they're not USB HID keycodes. If you wish to replicate similar behaviour in custom code within your firmware (e.g. inside `encoder_update_user()` or `process_record_user()`), the equivalent [RGB functions](#functions-idfunctions) should be used instead.
+
+
 !> By default, if you have both the [RGB Light](feature_rgblight.md) and the RGB Matrix feature enabled, these keycodes will work for both features, at the same time. You can disable the keycode functionality by defining the `*_DISABLE_KEYCODES` option for the specific feature.
 
 ## RGB Matrix Effects :id=rgb-matrix-effects
@@ -555,9 +557,7 @@ In order to change the delay of temperature decrease define
 
 ## Custom RGB Matrix Effects :id=custom-rgb-matrix-effects
 
-By setting `RGB_MATRIX_CUSTOM_USER = yes` in `rules.mk`, new effects can be defined directly from your keymap or userspace, without having to edit any QMK core files.
-
-To declare new effects, create a `rgb_matrix_user.inc` file in the user keymap directory or userspace folder.
+By setting `RGB_MATRIX_CUSTOM_USER = yes` in `rules.mk`, new effects can be defined directly from your keymap or userspace, without having to edit any QMK core files. To declare new effects, create a `rgb_matrix_user.inc` file in the user keymap directory or userspace folder.
 
 ?> Hardware maintainers who want to limit custom effects to a specific keyboard can create a `rgb_matrix_kb.inc` file in the root of the keyboard directory, and add `RGB_MATRIX_CUSTOM_KB = yes` to the keyboard level `rules.mk`.
 
@@ -810,6 +810,8 @@ void rgb_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {
 }
 ```
 
+?> Split keyboards will require layer state data syncing with `#define SPLIT_LAYER_STATE_ENABLE`. See [Data Sync Options](feature_split_keyboard?id=data-sync-options) for more details.
+
 #### Examples :id=indicator-examples
 
 This example sets the modifiers to be a specific color based on the layer state.  You can use a switch case here, instead, if you would like.  This uses HSV and then converts to RGB, because this allows the brightness to be limited (important when using the WS2812 driver).

docs/feature_rgblight.md

@@ -76,9 +76,10 @@ Changing the **Value** sets the overall brightness.<br>
 |`RGB_MODE_RGBTEST` |`RGB_M_T` |Red, Green, Blue test animation mode                                |
 |`RGB_MODE_TWINKLE` |`RGB_M_TW`|Twinkle animation mode                                              |
 
-!> By default, if you have both the RGB Light and the [RGB Matrix](feature_rgb_matrix.md) feature enabled, these keycodes will work for both features, at the same time. You can disable the keycode functionality by defining the `*_DISABLE_KEYCODES` option for the specific feature.
+?> `RGB_*` keycodes cannot be used with functions like `tap_code16(RGB_HUI)` as they're not USB HID keycodes. If you wish to replicate similar behaviour in custom code within your firmware (e.g. inside `encoder_update_user()` or `process_record_user()`), the equivalent [RGB functions](#functions) should be used instead.
 
-?> `RGB_*` keycodes cannot be used with functions like `tap_code16(RGB_HUI)` as they're not USB HID keycodes. If you wish to replicate similar behaviour in custom code within your firmware (e.g. inside `encoder_update_user()` or `process_record_user()`), the equivalent [RGB functions](#functions-idfunctions) should be used instead.
+
+!> By default, if you have both the RGB Light and the [RGB Matrix](feature_rgb_matrix.md) feature enabled, these keycodes will work for both features, at the same time. You can disable the keycode functionality by defining the `*_DISABLE_KEYCODES` option for the specific feature.
 
 ## Configuration
 
@@ -203,7 +204,7 @@ const uint8_t RGBLED_GRADIENT_RANGES[] PROGMEM = {255, 170, 127, 85, 64};
 
 ## Lighting Layers
 
-?> **Note:** Lighting Layers is an RGB Light feature, it will not work for RGB Matrix. See [RGB Matrix Indicators](feature_rgb_matrix.md?indicators) for details on how to do so.
+?> **Note:** Lighting Layers is an RGB Light feature, it will not work for RGB Matrix. See [RGB Matrix Indicators](feature_rgb_matrix.md#indicators) for details on how to do so.
 
 By including `#define RGBLIGHT_LAYERS` in your `config.h` file you can enable lighting layers. These make
 it easy to use your underglow LEDs as status indicators to show which keyboard layer is currently active, or the state of caps lock, all without disrupting any animations. [Here's a video](https://youtu.be/uLGE1epbmdY) showing an example of what you can do.