docs: change 'Parameters' title to more accurate 'Arguments'

docs/source/api/commands/click.md

@@ -17,7 +17,7 @@ Click a DOM element.  The DOM element must be in a "clickable" state prior to th
 .click(x, y, options)
 ```
 
-## Parameters
+## Arguments
 
 **position**
 

docs/source/api/commands/first.md

@@ -13,7 +13,7 @@ Get the first DOM element within a set of DOM elements.
 .first(options)
 ```
 
-## Parameters
+## Arguments
 
 **options**
 

docs/source/api/commands/route.md

@@ -21,7 +21,7 @@ cy.route(function() {})
 cy.route(options)
 ```
 
-## Parameters
+## Arguments
 
 **url**