Formmating: Add white space around vertical bar

[eksperimental]

It adds a white space around the vertical bar, improving readability of the code.
Carefully edited, and thoroughly reviewed three times.

While the amount of lines edited is significant, I think it's a great improvement in the clarity of the code.

[josevalim]

@lexmag it is your call. :)

[ericmj]

I have no strong opinion on it but personally I am not convinced it's an improvement.

[whatyouhide]

It's a huge amount of changes and we'll be blaming @eksperimental for years in git :P, but maybe this is an improvement after all (consistency is good). We'd have to pay a lot of attention when reviewing PRs so that we don't reintroduce x|y though.

[lexmag]

Let's fix this the other way around to [] -> [].

[eksperimental]

@lexmag all fixed, and a few more than i found with a search command. I looked for changes in line containing -> but i overlooked the ones with do:, so thanks for that!

the CI build failed, but I think it's unrelated, since locally it just passed

[vikram7]

I think this is a pretty good improvement for readability. Of the handful of Elixir docs that I've read through (like here), [one | two] seems to be more common than [one|two]. If that's the case, then it would be worth making sure they match up. 😄

[eksperimental]

@lexmag: rebased to master

[lexmag]

@eksperimental 💛

[lexmag]

Seems GitHub has fixed the whitespace ignoring feature ?w=1, with it we have 0 files changed. 😄

[eksperimental]

@lexmag sweet!
thanks for merging.. I didn't know about that cool feature