docs: add note

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Author: kgryte

lib/node_modules/@stdlib/ndarray/base/to-normalized-indices/README.md

@@ -64,6 +64,10 @@ var idx = toNormalizedIndices( [ 15, -15 ], 10 );
 
 <section class="notes">
 
+## Notes
+
+-   During normalization, a negative index is converted to a nonnegative index according to `max + idx + 1`. If, after normalization, the resolved index is still negative, the value is considered out-of-bounds.
+
 </section>
 
 <!-- /.notes -->