* Include details of abbreviations seen in exceptions

I have been getting Redis Timeout under high load, but it was not making sense at all. So i opened the source to understand what these abbreviations meant. I hope it will help people understand error messages a lot better.
My CPU Use case:
If Redis dedicated thread pool state looks good, and global thread pool has more free threads than minimum threads, but your CPU is usage is 90%, more likely you will face time outs, depending upon the size of bytes client is trying to read or write.

* Update Timeouts.md

Updating abbreviations in markdown table.