Update rc_parameter_map.msg

spelling mistakes

msg/rc_parameter_map.msg

@@ -6,6 +6,6 @@ bool[3] valid		#true for RC-Param channels which are mapped to a param
 int32[3] param_index	# corresponding param index, this field is ignored if set to -1, in this case param_id will be used
 char[51] param_id	# MAP_NCHAN * (ID_LEN + 1) chars, corresponding param id, null terminated
 float32[3] scale		# scale to map the RC input [-1, 1] to a parameter value
-float32[3] value0		# inital value around which the parameter value is changed
+float32[3] value0		# initial value around which the parameter value is changed
 float32[3] value_min	# minimal parameter value
 float32[3] value_max	# minimal parameter value