Remove the obsolete :apps option from the PutSession example

[rubas]

Before

The Localize.Plug.PutSession moduledoc example passes apps: to PutLocale:

plug Localize.Plug.PutLocale,
  apps: [:localize, :gettext],
  from: [:path, :query],
  gettext: MyApp.Gettext

Problem

• PutLocale has no :apps option since "Modernize the plug config" (806f632). init/1 keeps unknown keys without a warning, so a copied example compiles and the option does nothing.

After

plug Localize.Plug.PutLocale,
  from: [:path, :query],
  gettext: MyApp.Gettext

Details

Docs only: lib/localize/plug/put_session.ex, moduledoc. I did not add a warning for unknown PutLocale options, because {Module, function} and {Module, function, args} sources receive the full options list and can read their own keys.

Checks: mix format --check-formatted clean, mix test 267 passed.

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