Slices do not necessarily return a contiguous sequence. (#84)

* Slices do not necessarily return a contiguous sequence.

* Addressed PR feedback.

Author: springcomp

GRAMMAR.ABNF

@@ -252,7 +252,7 @@ bracket-specifier =/ "[]" ;; ## Flatten Operator
 ;; ```
 
 slice-expression  = [number] ":" [number] [ ":" [number] ] ;; ## Slices
-;; A slice expression allows you to select a contiguous subset of an array. A slice has a start, stop, and step value. The
+;; A slice expression allows you to select a subset of an array. A slice has a start, stop, and step value. The
 ;; general form of a slice is [start:stop:step], but each component is optional and can be omitted.
 ;;
 ;; ```note
@@ -264,9 +264,11 @@ slice-expression  = [number] ":" [number] [ ":" [number] ] ;; ## Slices
 ;;
 ;; - The first element in the extracted array is the index denoted by start.
 ;; - The last element in the extracted array is the index denoted by end - 1.
-;; - The step value determines how many indices to skip after each element is selected from the array. An array of 1
-;;   (the default step) will not skip any indices. A step value of 2 will skip every other index while extracting elements
-;;   from an array. A step value of -1 will extract values in reverse order from the array.
+;; - The step value determines how many indices to skip after each element is selected from the array.
+;;   The default step value of 1 will not skip any indices and will return a contiguous subset of the original array.
+;;   A step value greater than 1 will skip indices while extracting elements from an array. For instance, a step value of 2 will
+;;   skip every other index.
+;;   Negative step values start from the end of the array and extract elements in reverse order.
 ;;
 ;; Slice expressions adhere to the following rules:
 ;;