fixed typos & simplified sentences in 01-introduction
fixed typos & shortened some phrases in first part of 02-getting-started.md.erb. fixed missing negation in a note on packages.
fixed typos & rephrased for simplicity in second part of 02-getting-started.md.erb.
another typo in 02-getting-started.md.erb.
reverted 'Du' to 'du' in 01-introduction.md.erb and 02-getting-started.md.erb
added a rule for noun ordering, fixed a sentence in 02-getting-started.md.erb
merge
second merge