Incorrect header comments in CodeGen template files

[maryamariyan]

The auto generated files under src/Microsoft.ML.CodeGenerator/Templates/ directory are creating incorrect header comments and need to be modified.

Refer to:
#4365 (comment)

cc: @JakeRadMSFT @LittleLittleCloud @rustd @eerhardt @sharwell

[mstfbl]

This issue was fixed as part of the changes in PR #4365 .