feat: update namespace TypeScript declarations

PR-URL: #2697
Co-authored-by: Athan Reines <[email protected]>
Reviewed-by: Athan Reines <[email protected]> 
Signed-off-by: stdlib-bot <[email protected]>

Author: stdlib-bot

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

@@ -22,6 +22,7 @@
 
 import dlacpy = require( '@stdlib/lapack/base/dlacpy' );
 import dlaswp = require( '@stdlib/lapack/base/dlaswp' );
+import dpttrf = require( '@stdlib/lapack/base/dpttrf' );
 
 /**
 * Interface describing the `base` namespace.
@@ -94,6 +95,36 @@ interface Namespace {
 	* // A => <Float64Array>[ 3.0, 4.0, 1.0, 2.0, 5.0, 6.0 ]
 	*/
 	dlaswp: typeof dlaswp;
+
+	/**
+	* Computes the `L * D * L^T` factorization of a real symmetric positive definite tridiagonal matrix `A`.
+	*
+	* @param N - order of matrix `A`
+	* @param D - the `N` diagonal elements of `A`
+	* @param E - the `N-1` subdiagonal elements of `A`
+	* @returns status code
+	*
+	* @example
+	* var Float64Array = require( '@stdlib/array/float64' );
+	*
+	* var D = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+	* var E = new Float64Array( [ 1.0, 2.0 ] );
+	*
+	* ns.dpttrf( 3, D, E );
+	* // D => <Float64Array>[ 4, 4.75, ~5.15789 ]
+	* // E => <Float64Array>[ 0.25, ~0.4210 ]
+	*
+	* @example
+	* var Float64Array = require( '@stdlib/array/float64' );
+	*
+	* var D = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+	* var E = new Float64Array( [ 1.0, 2.0 ] );
+	*
+	* ns.dpttrf.ndarray( 3, D, 1, 0, E, 1, 0 );
+	* // D => <Float64Array>[ 4, 4.75, ~5.15789 ]
+	* // E => <Float64Array>[ 0.25, ~0.4210 ]
+	*/
+	dpttrf: typeof dpttrf;
 }
 
 /**