docs: remove dtype restriction

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Author: kgryte

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

@@ -241,7 +241,7 @@ var bool = ( out === y );
 
 The method has the following parameters:
 
--   **x**: input [ndarray][@stdlib/ndarray/ctor]. Must have a real-valued or generic [data type][@stdlib/ndarray/dtypes].
+-   **x**: input [ndarray][@stdlib/ndarray/ctor].
 -   **out**: output [ndarray][@stdlib/ndarray/ctor].
 -   **options**: function options (_optional_).
 -   **clbk**: callback function.