fix reverted documentation errors
3fde29f reverted b074038 and 835fe5d because prior commits fixed auto generated files.
This commit fixes original rpy files.
Merge pull request #187 from vbkaisetsu/fix-doc

fix reverted documentation errors
Merge pull request #188 from kyouryuukunn/add_doc3

More documentation from kyouryuukunn
Edit the label documentation.
Split persistent out into its own rst file.
Document MultiPersistent.
Check in the generated docs.
Fix syntax highlighting.
Fix bad rst.x
Merge branch 'devel' of https://github.com/renpy/renpy into add_doc3
move 'add doc about after_warp
fix doc