Fix comment syntax errors

I found some sytax errors in the comments while reading the source code.

such as the fallowing examples:

at hbase-asyncfs.src.main.java.org.apache.hadoop.hbase.util.RecoverLeaseFSUtils.java(line 95, 121)

at hbase-asyncfs.src.main.java.org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutput.java(line 87, 107)

at hbase-balancer.src.main.java.org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.java(line 53, 59)

......

In fact, I did a simple scan and there were quite a few errors, although only a few affected the reading. I think maybe we can fix it, even if it's not in a hurry.