- Specify `NgForm` gets applied by default on `<form>` elements before the long example using it
- Move the strange (and questioned in a commented line) snippet about undefined ref vars in a standalone paragraph and clarify its meanings (adding the part about directive just because there was something similar already there)
- Extend and modify `*ngFor` example, since in the original that was misleading to think reference variable couldn't be used inside a loop
- Remove two lines stating that with `*ngIf` and `*ngFor` the framework cannot know if a template is ever instantiated (can't see how this relate with the page)
- Add an explanation of assignment of default `$implicit` value to undefined input variables
- Modify template example for template input variable to be a complete ngForOf loop instead of the original poor intelligible truncated one
- Replace last generic statements about variable namespaces with a more pragmatic and explanatory one concerning the resolution in case of homonymy

PR Close #45455