Fixes a few spelling mistake in instructions for lab101 and lab103

In lab101-solution.adoc, fix annalist -> analyst

In lab103.adoc, fix a reference to the 4computer-12processes.xml dataset
where a reference to 100computer-300processes.xml was due.
Merge pull request #2 from oskopek/quick-spell-fix

Fixes a few spelling mistakes in instructions for lab101 and lab103