Update FAQ and Glossary to clarify that Storage Chain =\= Payment Chain

[MantisClone]

Problem(s)

• The FAQ section doesn't use the words "storage chain" or "payment chain" and it probably should.
• The Glossary doesn't include "Storage Chain" or "Payment Chain" and it probably should.

Solution(s)

• Update the FAQ to include the words "Storage Chain" and "Payment Chain"
• Add "Storage Chain" and "Payment Chain" to the Glossary