Update Mixer.md

I have tried the latest released betaflight firmware with my 3D helicopter to see the main motor spins and controlled by M1 motor, the S1-S3 servos move and control the cyclic swashplate, and S4 servo controls the rudder.
betaflight · Aug 23, 2020 · d529e40 · d529e40
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commit d529e40
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/Mixer.md b/docs/Mixer.md
@@ -30,7 +30,7 @@ You can also use the Command Line Interface (CLI) to set the mixer type:
 | OCTOFLATP        | Octocopter-FlatPlus       | M1-M8          | None             |
 | OCTOFLATX        | Octocopter-FlatX          | M1-M8          | None             |
 | AIRPLANE         | Fixed wing; Ax2, R, E     | M1             | S1, S2, S3, S4   |
-| HELI_120_CCPM    |                           |                |                  |
+| HELI_120_CCPM    | 3D-capible Helicopter     | M1             | S1, S2, S3, S4   |
 | HELI_90_DEG      |                           |                |                  |
 | VTAIL4           | Quadcopter with V-Tail    | M1-M4          | N/A              |
 | HEX6H            | Hexacopter-H              | M1-M6          | None             |