docs: update copy

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/ndarray/flatten/README.md

@@ -72,7 +72,7 @@ The function accepts the following options:
 
 -   **depth**: maximum number of input [ndarray][@stdlib/ndarray/ctor] dimensions to flatten.
 
--   **dtype**: output ndarray [data type][@stdlib/ndarray/dtypes]. By default, the function an [ndarray][@stdlib/ndarray/ctor] having the same [data type][@stdlib/ndarray/dtypes] as a provided input [ndarray][@stdlib/ndarray/ctor].
+-   **dtype**: output ndarray [data type][@stdlib/ndarray/dtypes]. By default, the function returns an [ndarray][@stdlib/ndarray/ctor] having the same [data type][@stdlib/ndarray/dtypes] as a provided input [ndarray][@stdlib/ndarray/ctor].
 
 By default, the function flattens all dimensions of the input [ndarray][@stdlib/ndarray/ctor]. To flatten to a desired depth, specify the `depth` option.