Inconsistent key names in COPY / RENAME / RENAMEX / PUBLISH command documentation and other fixes.

[toddmerrill]

I tried to be conservative with the parameter name changes, only changing methods with the same function signature as in the Redis docs. I couldn't bring myself to change param 'dbIndex' to 'db' in RedisOperations.move(). I think our name is more descriptive. The other changes are javadoc inconsistencies I found when reading through. Let me know if you need anything changed.