docs: remove direct calls to require

[felipenoris]

Regarding the changes on workflow-tips:

• isinteractive() evaluates to false
• a call to include("file.jl") on .juliarc.jl looks for files at the user's home folder, so I added a call to pwd().

[tkelman]

isinteractive() evaluates to false

When? It's supposed to be true for a REPL session and false for scripts.

[felipenoris]

Inside .juliarc.jl:

~$ cat .juliarc.jl

if isinteractive()
    println("Interactive")
else
    println("Not interactive")
end

~$ ~/Documents/src/julia/julia
Not interactive

[tkelman]

Ah. Wonder if/when that changed?

[yuyichao]

#10779

[felipenoris]

Looks like a regression. I should put it back in the docs.

[yuyichao]

It's intentional afaict.

[felipenoris]

So I guess there's nothing to change for this PR.

[yuyichao]

If you only want to use it in repo, you should call it in atreplinit instead.

[tkelman]

I'd just do include("_init.jl"), why is the joinpath needed?

[yuyichao]

include is relative to current file. so at least this makes it consistent with the isfile check. I'm not sure which one (relative to current file or PWD) is the goal here.

[felipenoris]

The example on the docs puts the case when _init.jl is in the current dir:
...then calling julia from that directory...
I figured isfile checks current dir, but include will check the dir where .juliarc.jl is located.