[EN] lessons/ecto/querying Rework part about keyword and query expressions (#2123)
[EN] lessons/ecto/querying Rework part about keyword and query expressions (#2123)

* en/lessons/ecto/querying rework part keyword and query expression part

* Update en/lessons/ecto/querying.md

Co-Authored-By: marocchino <924c959d2f947b2ae3fdeabf5d926a239c5d5ef9@users.noreply.github.com>

* address review comments

nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir-school,doomspork/elixir-school,doomspork/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir_school