Improve typescript doc ( add info about ["strict":true] and ["noImplicitThis": true] )

[wildwind123]

Hello, i think it will be helpful, if it will be on doc. I had problem with types this.[property] - undefined

And i solve this.
types work if on tsconfig enabled option
"strict":true (this option enabled seven option (noImplicitAny noImplicitThis alwaysStrict strictBindCallApply strictNullChecks strictFunctionTypes strictPropertyInitialization)).
this option very bad if you migrating from js to ts etc, if this large project. And refactoring required long time.

or you can add only one option
"noImplicitThis": true

I think it will be helpful for newbie user or who don't use option "strict": true fully.

[posva]

Sure, can you open a pr? It should go in the typescript section or in getting started

[wildwind123]

Sure, can you open a pr? It should go in the typescript section or in getting started

Created. #1576

But not sure, it good or not )).