[Code Style] DocBlock and comment fixes and improvements.Fix #3002. Fix #3003. Fix #3004. Fix #3005. Fix #3006. Fix #3007. Fix #3008. Fix #3009. Fix #3010. Fix #3011. Fix #3019

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] Concat operator must be surrounded by spaces.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock and comment fixes and improvements.

[Code Style] DocBlock fixes.