Updated commands in Delete Key Value Pair and Combiner that were outdated

[Amemeda]

Combiner:

• $ bin/accumulo shell -u username" updated to "$ accumulo shell -u root"
• added "username@instance examples.runners> config -t examples.runners -s table.class.loader.context=file:///path/to/accumulo-examples/target/accumulo-examples.jar" before setiter command

Delete Key Value Pair

• "$ /path/to/accumulo shell -u username -p secret" up updated to "$ accumulo shell --user root --password secret" in 3 locations
• "$ /path/to/accumulo rfile-info -d hdfs://localhost/accumulo/tables/1t/default_tablet/F00007em.rf" updated to "$ accumulo file rfile-info -d hdfs://localhost/accumulo/tables/1t/default_tablet/F00007em.rf" in 3 locations

[DomGarguilo]

For the combiner example, I'm actually not sure that we need that added line to set the jar as the classloader context. I think that is contained in the jar that we copy over into the lib dir as outline in the setup steps.

For the combiner I ran through the example and things worked when I followed the doc with these exceptions:

1. I had to restart my accumulo instance so the jar was picked up by the tservers (maybe this could be pointed out in the description of this doc)
2. I did not do the config -t examples.runners -s table.class.loader.context= step

[DomGarguilo]

I'm not too sure why the combiner doc is just a copy and paste of the whole shell as opposed to the commands like all the other docs. Probably not worth changing that here but we should update the version: 2.1.0-SNAPSHOT