Update RELEASE_NOTES.md

change `Cocostudio Reader` to `Cocos Studio Reader`
Update RELEASE_NOTES.md

 `ClippingRectangNode` to `ClippingRectangleNode, 
`effecient` to `efficient`
Update RELEASE_NOTES.md
Update RELEASE_NOTES.md
Update RELEASE_NOTES.md

`trianle command` to `triangle command`
Update RELEASE_NOTES.md

'Reskin' to `Reskin`
'Attachment' to `Attachment`
'Better support for FBX' to `Better support for FBX`
etc.
Merge commit 'f2e24545538829702e03e042c87b37370bd6f96a' into theCreature