Ham, not HAM

Originally discovered in 1ffa55d39a

https://www.kb6nu.com/ham-ham-radio-ham-radio-amateur-radio/#:~:text=Of%20course%20either%20term%20may,be%20avoided%20at%20all%20costs.

mesh.proto

@@ -325,7 +325,7 @@ message User {
   HardwareModel hw_model = 6;
 
   /*
-   * In some regions HAM radio operators have different bandwidth limitations than others.
+   * In some regions Ham radio operators have different bandwidth limitations than others.
    * If this user is a licensed operator, set this flag.
    * Also, "long_name" should be their licence number.
    */