fix escaped terminatiors in sigil
Fix @doc of List.keyfind,keymember? and keydelete

Given params is `key`, so replace `item` with `key`.
Replace `defstruct/2` with `defstruct/1`
Merge pull request #2845 from yui-knk/fix/doc_defstruct

Replace `defstruct/2` with `defstruct/1`
Merge pull request #2844 from yui-knk/fix/list_doc

Fix @doc of List.keyfind,keymember? and keydelete
Merge pull request #2841 from jw2013/master

fix escaped terminators in sigil
Merge branch 'master' of https://github.com/elixir-lang/elixir