Same comment in dispatcher.go

[StefanGajic]

I have found the same comment in pkg> chainsync> dispatcher> dispatcher.go
Method SyncTracker and method SendOwnBlock have same comment which is // SendOwnBlock handles chain info from a node's own mining system

[Fatman13]

Thanks for the catch! Will take this to the team!

@zl03jsj 亮兄，这个STM团队发现的这个2个函数好像使用了相同的注释。亮兄看看，哪儿个注释是否有问题？