docs: update parameter name

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---

Author: kgryte

lib/node_modules/@stdlib/stats/max-by/README.md

@@ -60,7 +60,7 @@ The function has the following parameters:
 The invoked callback is provided three arguments:
 
 -   **value**: current array element.
--   **idx**: current array element index.
+-   **index**: current array element index.
 -   **array**: input ndarray.
 
 To set the callback execution context, provide a `thisArg`.

lib/node_modules/@stdlib/stats/min-by/README.md

@@ -60,7 +60,7 @@ The function has the following parameters:
 The invoked callback is provided three arguments:
 
 -   **value**: current array element.
--   **idx**: current array element index.
+-   **index**: current array element index.
 -   **array**: input ndarray.
 
 To set the callback execution context, provide a `thisArg`.

lib/node_modules/@stdlib/stats/range-by/README.md

@@ -68,7 +68,7 @@ The function has the following parameters:
 The invoked callback is provided three arguments:
 
 -   **value**: current array element.
--   **idx**: current array element index.
+-   **index**: current array element index.
 -   **array**: input ndarray.
 
 To set the callback execution context, provide a `thisArg`.