Update e2e docs examples

Updates the e2e docs to use brackets consistently in examples.
Specifically, we use brackets for method calls that aren't for an
internal DSL as per the ruby style guide
https://rubystyle.guide/#method-call-parentheses

doc/development/testing_guide/end_to_end/best_practices.md

@@ -309,10 +309,10 @@ This action can also unintentionally click other elements, altering the test sta
 # Clicking another element to blur an input
 def add_issue_to_epic(issue_url)
   find_element(:issue_actions_split_button).find('button', text: 'Add an issue').click
-  fill_element :add_issue_input, issue_url
+  fill_element(:add_issue_input, issue_url)
   # Clicking the title blurs the input
-  click_element :title
-  click_element :add_issue_button
+  click_element(:title)
+  click_element(:add_issue_button)
 end
 
 # Using native mouse click events in the case of a mask/overlay

doc/development/testing_guide/end_to_end/dynamic_element_validation.md

@@ -39,7 +39,7 @@ appear on the webpage, or the test to navigate away from the page entirely.
 Dynamic element validation is instituted when using
 
 ```ruby
-click_element :my_element, Some::Page
+click_element(:my_element, Some::Page)
 ```
 
 ### Required Elements
@@ -79,7 +79,7 @@ class MyPage < Page::Base
   end
 
   def open_layer
-    click_element :my_element, Layer::MyLayer
+    click_element(:my_element, Layer::MyLayer)
   end
 end
 
@@ -109,7 +109,7 @@ Given the [source](#examples) ...
 
 ```ruby
 def open_layer
-  click_element :my_element, Layer::MyLayer
+  click_element(:my_element, Layer::MyLayer)
 end
 ```
 

doc/development/testing_guide/end_to_end/page_objects.md

@@ -201,7 +201,7 @@ We can select on that specific issue by matching on the Rails model.
 ```ruby
 class Page::Project::Issues::Index < Page::Base
   def has_issue?(issue)
-    has_element? :issue, issue_title: issue
+    has_element?(:issue, issue_title: issue)
   end
 end
 ```

doc/development/testing_guide/end_to_end/style_guide.md

@@ -19,7 +19,7 @@ E.g.:
 ```ruby
 def click_ci_cd_pipelines
   within_sidebar do
-    click_element :link_pipelines
+    click_element(:link_pipelines)
   end
 end
 ```