Small Markdown Patch for docs/feature_rgb_matrix.md (#17171)

docs/feature_rgb_matrix.md

@@ -519,7 +519,7 @@ All RGB keycodes are currently shared with the RGBLIGHT system:
 |`RGB_VAD`          |          |Decrease value (brightness), increase value when Shift is held                        |
 |`RGB_SPI`          |          |Increase effect speed (does not support eeprom yet), decrease speed when Shift is held|
 |`RGB_SPD`          |          |Decrease effect speed (does not support eeprom yet), increase speed when Shift is held|
-|`RGB_MODE_PLAIN`   |`RGB_M_P `|Static (no animation) mode                                                            |
+|`RGB_MODE_PLAIN`   |`RGB_M_P` |Static (no animation) mode                                                            |
 |`RGB_MODE_BREATHE` |`RGB_M_B` |Breathing animation mode                                                              |
 |`RGB_MODE_RAINBOW` |`RGB_M_R` |Full gradient scrolling left to right (uses the `RGB_MATRIX_CYCLE_LEFT_RIGHT` mode)   |
 |`RGB_MODE_SWIRL`   |`RGB_M_SW`|Full gradient spinning pinwheel around center of keyboard (uses `RGB_MATRIX_CYCLE_PINWHEEL` mode) |