docs: update copy

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Author: kgryte

lib/node_modules/@stdlib/stats/mean/docs/repl.txt

@@ -11,8 +11,8 @@
         Function options.
 
     options.dtype: string (optional)
-        Output array data type. Must be a real floating-point or "generic" data
-        type.
+        Output array data type. Must be a real-valued floating-point or
+        "generic" data type.
 
     options.dims: Array<integer> (optional)
         List of dimensions over which to perform a reduction. If not provided,