docs: update step to include removing symbol from namespace type declarations

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---

Author: kgryte

docs/contributing/moving_packages.md

@@ -193,6 +193,44 @@ If that file includes an exported symbol from the original package, remove it. F
 - setReadOnly( ns, 'dmax', require( '@stdlib/stats/base/dmax' ) );
 ```
 
+Next, open the `docs/types/index.d.ts` file found in the parent namespace of the original package (e.g., `lib/node_modules/@stdlib/stats/base/docs/types/index.d.ts`).
+
+If that file includes an exported symbol from the origin package, remove it. For example,
+
+```diff
+- import dmax = require( '@stdlib/stats/strided/dmax' );
+```
+
+and
+
+```diff
+-    /**
+-    * Computes the maximum value of a double-precision floating-point strided array.
+-    *
+-    * @param N - number of indexed elements
+-    * @param x - input array
+-    * @param strideX - stride length
+-    * @returns minimum value
+-    *
+-    * @example
+-    * var Float64Array = require( '@stdlib/array/float64' );
+-    *
+-    * var x = new Float64Array( [ 1.0, -2.0, 2.0 ] );
+-    *
+-    * var v = ns.dmax( x.length, x, 1 );
+-    * // returns 2.0
+-    *
+-    * @example
+-    * var Float64Array = require( '@stdlib/array/float64' );
+-    *
+-    * var x = new Float64Array( [ 1.0, -2.0, 2.0 ] );
+-    *
+-    * var v = ns.dmax.ndarray( x.length, x, 1, 0 );
+-    * // returns 2.0
+-    */
+-    dmax: typeof dmax;
+```
+
 ### 7. Commit the changes to the parent namespace
 
 If you removed an exported symbol from the parent namespace, commit those changes, making note that this is a breaking change.