feat: update blas/base/ndarray TypeScript declarations

Signed-off-by: stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>

Author: stdlib-bot

lib/node_modules/@stdlib/blas/base/ndarray/docs/types/index.d.ts

@@ -24,6 +24,7 @@ import dasum = require( '@stdlib/blas/base/ndarray/dasum' );
 import daxpy = require( '@stdlib/blas/base/ndarray/daxpy' );
 import ddot = require( '@stdlib/blas/base/ndarray/ddot' );
 import gasum = require( '@stdlib/blas/base/ndarray/gasum' );
+import gaxpy = require( '@stdlib/blas/base/ndarray/gaxpy' );
 import gdot = require( '@stdlib/blas/base/ndarray/gdot' );
 import sasum = require( '@stdlib/blas/base/ndarray/sasum' );
 import saxpy = require( '@stdlib/blas/base/ndarray/saxpy' );
@@ -116,6 +117,32 @@ interface Namespace {
 	*/
 	gasum: typeof gasum;
 
+	/**
+	* Multiplies a one-dimensional ndarray `x` by a constant `alpha` and adds the result to a one-dimensional ndarray `y`.
+	*
+	* @param arrays - array-like object containing an input ndarray, an output ndarray, and a zero-dimensional ndarray containing a scalar constant
+	* @returns output ndarray
+	*
+	* @example
+	* var scalar2ndarray = require( '@stdlib/ndarray/base/from-scalar' );
+	* var ndarray = require( '@stdlib/ndarray/base/ctor' );
+	*
+	* var xbuf = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	* var x = new ndarray( 'generic', xbuf, [ 5 ], [ 1 ], 0, 'row-major' );
+	*
+	* var ybuf = [ 1.0, 1.0, 1.0, 1.0, 1.0 ];
+	* var y = new ndarray( 'generic', ybuf, [ 5 ], [ 1 ], 0, 'row-major' );
+	*
+	* var alpha = scalar2ndarray( 5.0, 'generic', 'row-major' );
+	*
+	* var z = ns.gaxpy( [ x, y, alpha ] );
+	* // returns <ndarray>[ 6.0, 11.0, 16.0, 21.0, 26.0 ]
+	*
+	* var bool = ( z === y );
+	* // returns true
+	*/
+	gaxpy: typeof gaxpy;
+
 	/**
 	* Computes the dot product of two one-dimensional ndarrays.
 	*