Variables, Task 1: Change the "name" variable to avoid ambiguity for deprecated naming

[aseiis]

The first task of the variables page suggest to declare and use two variables :
admin and name.

Using name as the name of the variable can be confusing and code editors will show a warning: 'name' is deprecated.ts(6385)
lib.dom.d.ts(17693, 5): The declaration was marked as deprecated here. (VSCode)

name variable should be renamed

[joaquinelio]

I didnt try...
but it is not a reserved word,
"let name" scope should override the global "name".
editors shouldnt warn I think.

anyway, userName would comply with article recommendations

[aseiis]

I gave the warning VSCode gave me above (name variable was crossed out).
Yup, I agree: username would better fit I believe!

#3299