[SPARK-3378] [DOCS] Replace the word "SparkSQL" with right word "Spark SQL"

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #2251 from sarutak/SPARK-3378 and squashes the following commits:

0bfe234 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-3378
bb5938f [Kousuke Saruta] Replaced rest of "SparkSQL" with "Spark SQL"
6df66de [Kousuke Saruta] Replaced "SparkSQL" with "Spark SQL"
Added sql/hbase module for 0.96.1.1-hadoop2
Fixed assembly for hbase
Skeleton HBaseSQLContext working
incremental HBaseStrategies updates
Removed spurious manual merge error in pom.xml
add HBaseSQLParser
Added files missed to checkin
change the variable names
add delete table method
add CREATE and DROP
add ALTER and modify other part