Tiny doc fixes in decoding.rst (and a few whitespace changes)
For consistency use visuali*z*ation rather than visuali*s*ation
Main fix on l. 179 for >>> folding in the doc. Plenty of other whitespace differences
Fix RHS "Table Of Contents" link which was pointing to index.html rather than user_guide.html
Fix typo (plus some whitespace differences)
Add missing 's'
Merge pull request #232 from lesteve/doc-minor-fixes

Doc minor fixes