docs: update copy

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/sdsnanmeanors/README.md

@@ -79,7 +79,7 @@ The function has the following parameters:
 ## Notes
 
 -   If provided an empty one-dimensional ndarray, the function returns `NaN`.
--   If every indexed element is `NaN`, the function returns `NaN`.
+-   If every element is `NaN`, the function returns `NaN`.
 -   Accumulated intermediate values are stored as double-precision floating-point numbers.
 
 </section>