[Docs] Fixes for feature_rgblight.md (#8514)

* remove extra comma that breaks the RGBLight Layers example

* linting

- use four spaces instead of tabs for indenting
- remove trailing spaces

docs/feature_rgblight.md

@@ -182,16 +182,16 @@ To define a layer, we modify `keymap.c` to list out LED ranges and the colors we
 ```c
 // Light LEDs 6 to 9 and 12 to 15 red when caps lock is active. Hard to ignore!
 const rgblight_segment_t PROGMEM my_capslock_layer[] = RGBLIGHT_LAYER_SEGMENTS(
-	{6, 4, HSV_RED},       // Light 4 LEDs, starting with LED 6
-	{12, 4, HSV_RED}       // Light 4 LEDs, starting with LED 12
+    {6, 4, HSV_RED},       // Light 4 LEDs, starting with LED 6
+    {12, 4, HSV_RED}       // Light 4 LEDs, starting with LED 12
 );
 // Light LEDs 9 & 10 in cyan when keyboard layer 1 is active
 const rgblight_segment_t PROGMEM my_layer1_layer[] = RGBLIGHT_LAYER_SEGMENTS(
-	{9, 2, HSV_CYAN}
+    {9, 2, HSV_CYAN}
 );
 // Light LEDs 11 & 12 in purple when keyboard layer 2 is active
 const rgblight_segment_t PROGMEM my_layer2_layer[] = RGBLIGHT_LAYER_SEGMENTS(
-	{11, 2, HSV_PURPLE}, 
+    {11, 2, HSV_PURPLE}
 );
 // etc..
 ```
@@ -201,14 +201,14 @@ We combine these layers into an array using the `RGBLIGHT_LAYERS_LIST` macro, an
 ```c
 // Now define the array of layers. Later layers take precedence
 const rgblight_segment_t* const PROGMEM my_rgb_layers[] = RGBLIGHT_LAYERS_LIST(
-	my_capslock_layer,
-	my_layer1_layer,    // Overrides caps lock layer
-	my_layer2_layer     // Overrides other layers
+    my_capslock_layer,
+    my_layer1_layer,    // Overrides caps lock layer
+    my_layer2_layer     // Overrides other layers
 );
 
 void keyboard_post_init_user(void) {
-	// Enable the LED layers
-	rgblight_layers = my_rgb_layers;
+    // Enable the LED layers
+    rgblight_layers = my_rgb_layers;
 }
 ```
 
@@ -216,15 +216,15 @@ Finally, we enable and disable the lighting layers whenever the state of the key
 
 ```c
 layer_state_t layer_state_set_user(layer_state_t state) {
-	// Both layers will light up if both kb layers are active
-	rgblight_set_layer_state(1, layer_state_cmp(state, 1));
-	rgblight_set_layer_state(2, layer_state_cmp(state, 2));
-	return state;
+    // Both layers will light up if both kb layers are active
+    rgblight_set_layer_state(1, layer_state_cmp(state, 1));
+    rgblight_set_layer_state(2, layer_state_cmp(state, 2));
+    return state;
 }
 
 bool led_update_user(led_t led_state) {
-	rgblight_set_layer_state(0, led_state.caps_lock);
-	return true;
+    rgblight_set_layer_state(0, led_state.caps_lock);
+    return true;
 }
 ```