content: Minor edits to collections functions

Author: jmooring

content/en/functions/collections/Apply.md

@@ -11,9 +11,9 @@ params:
 aliases: [/functions/apply]
 ---
 
-The `apply` function takes three or more arguments, depending on the function being applied to the collection elements.
+The `apply` function takes three or more arguments, depending on the function being applied to the slice elements.
 
-The first argument is the collection itself, the second argument is the function name, and the remaining arguments are passed to the function, with the string `"."` representing the collection element.
+The first argument is the slice itself, the second argument is the function name, and the remaining arguments are passed to the function, with the string `"."` representing the slice element.
 
 ```go-html-template
 {{ $s := slice "hello" "world" }}

content/en/functions/collections/First.md

@@ -39,7 +39,7 @@ To use the `collections.First` function with a page collection:
 {{ end }}
 ```
 
-Set `N` to zero to return an empty collection:
+Set `N` to zero to return an empty slice:
 
 ```go-html-template
 {{ $emptyPageCollection := first 0 .Pages }}

content/en/functions/collections/Last.md

@@ -39,7 +39,7 @@ To use the `collections.Last` function with a page collection:
 {{ end }}
 ```
 
-Set `N` to zero to return an empty collection:
+Set `N` to zero to return an empty slice:
 
 ```go-html-template
 {{ $emptyPageCollection := last 0 .Pages }}