Updated commands in Compaction Strategy Example that were outdated

[Amemeda]

Updated 10 commands that were outdated in compactionStrategy.md:

• $ accumulo check-compaction-config /path/to/myconfig (missing "conf" after "accumulo")
• $ accumulo shell -u -p -e "flush -t examples.test1" (should contain "--user root --password secret" changed in 5 locations)
• $ accumulo shell -u -p -e "compact -t examples.test1 -w" (hould contain "--user root --password secret" changed in 2locations)
• accumulo rfile-info hdfs:///accumulo/tables/2/default_tablet/A000000a.rf (missing "file" after "accumulo" and "$" at beginning, changed in 2 locations)