docs: add note and fix note

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Author: kgryte

lib/node_modules/@stdlib/array/base/fill/README.md

@@ -72,7 +72,7 @@ var bool = ( out === x );
 
 -   If provided an array-like object without a `fill` method, the function manually sets input array elements to a provided fill value.
 
--   Negative start and end indices are resolved to positive indices by counting from the end of the array with `-1` corresponding to the last indexed element.
+-   Negative `start` and `end` indices are resolved to positive indices by counting from the end of the array with `-1` corresponding to the last indexed element.
 
 -   The function **mutates** the input array.
 

lib/node_modules/@stdlib/array/base/fill/docs/repl.txt

@@ -8,9 +8,13 @@
 
         x.fill( value, start, end )
 
-    If provided an array-like object without a `value` method, the function
+    If provided an array-like object without a `fill` method, the function
     manually sets input array elements to the specified value.
 
+    Negative `start` and `end` indices are resolved to positive indices by
+    counting from the end of the array with `-1` corresponding to the last
+    indexed element.
+
     Parameters
     ----------
     x: ArrayLikeObject