fix for a few missing lines in the extras docs

docs/extras/array.md

@@ -11,6 +11,12 @@ That means that you can paginate the array independently from any other kind of
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
+```ruby
+require 'pagy/extras/array'
+```
+
 In a controller:
 
 ```ruby

docs/extras/bulma.md

@@ -9,6 +9,12 @@ This extra adds nav helper and templates for the Bulma CSS [pagination component
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
+```ruby
+require 'pagy/extras/bulma'
+```
+
 Render the navigation links in some view...
 with a fast helper:
 

docs/extras/elasticsearch_rails.md

@@ -9,6 +9,12 @@ Paginate `ElasticsearchRails::Results` objects efficiently avoiding expensive ob
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
+```ruby
+require 'pagy/extras/elasticsearch_rails'
+```
+
 In a controller:
 
 ```ruby

docs/extras/foundation.md

@@ -9,6 +9,12 @@ This extra adds nav helper and templates for the Foundation [pagination componen
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
+```ruby
+require 'pagy/extras/foundation'
+```
+
 Render the navigation links in some view...
 with a fast helper:
 

docs/extras/materialize.md

@@ -9,6 +9,12 @@ This extra adds nav helpers for the Materialize CSS [pagination component](https
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
+```ruby
+require 'pagy/extras/materialize'
+```
+
 Render the navigation links in some view...
 with a fast helper:
 

docs/extras/searchkick.md

@@ -11,6 +11,12 @@ The `Searchkick::Results` object has already done pagination calculations, we ju
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
+```ruby
+require 'pagy/extras/searchkick'
+```
+
 In a controller:
 
 ```ruby

docs/extras/trim.md

@@ -11,8 +11,9 @@ This extra is needed only for very specific scenarios, for example if you need t
 
 See [extras](../extras.md) for general usage info.
 
+In the `pagy.rb` initializer:
+
 ```ruby
-# in the Pagy initializer
 require 'pagy/extras/trim'
 ```