Update ch09.asciidoc

Minor changes/typos
Adding another comma following the changes from Issue #117
Merge branch 'erikwam-patch-15' into develop
fixing market cap description for Dogecoin
Merge pull request #119 from jlopp/chapter09Fixes

fixing market cap description for Dogecoin
SPV stands for Simplified Payment Verification
Changing 'Simple Payment Verification' to 'Simplified Payment Verification' in all other chapters to per issue #124.
Merge branch 'biafra23-patch-1' into develop
Merge branch 'lornestar_suggestions' into develop