Add indefinite article

Planeshifter · Planeshifter · commit a31ded13a0a9 · 2017-06-10T23:18:27.000+02:00
diff --git a/lib/node_modules/@stdlib/assert/is-between-array/docs/repl.txt b/lib/node_modules/@stdlib/assert/is-between-array/docs/repl.txt
@@ -25,7 +25,7 @@
     Returns
     -------
     bool: boolean
-        Boolean indicating whether a value is array-like object where every
+        Boolean indicating whether a value is an array-like object where every
         element is between two values.
 
     Examples
