docs: fix note

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/count-if/README.md

@@ -152,7 +152,7 @@ var count = ctx.count;
 ## Notes
 
 -   For very high-dimensional ndarrays which are non-contiguous, one should consider copying the underlying data to contiguous memory before performing the operation in order to achieve better performance.
--   If provided an empty ndarray, the function returns `true`.
+-   If provided an empty ndarray, the function returns `0`.
 
 </section>