docs: add DZ_Z docs

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Author: kgryte

lib/node_modules/@stdlib/math/base/napi/binary/README.md

@@ -492,6 +492,91 @@ The function accepts the following arguments:
 void stdlib_math_base_napi_di_d( napi_env env, napi_callback_info info, double (*fcn)( double, int32_t ) );
 ```
 
+#### STDLIB_MATH_BASE_NAPI_MODULE_DZ_Z( fcn )
+
+Macro for registering a Node-API module exporting an interface invoking a binary function accepting a double-precision complex floating-point number and a double-precision floating-point number and returning a double-precision complex floating-point number.
+
+```c
+#include "stdlib/complex/float64/ctor.h"
+#include "stdlib/complex/float64/reim.h"
+
+static stdlib_complex128_t mul( const double y, const stdlib_complex128_t x ) {
+    double xre;
+    double xim;
+    double re;
+    double im;
+
+    stdlib_complex128_reim( x, &xre, &xim );
+
+    re = xre * y;
+    im = xim * y;
+
+    return stdlib_complex128( re, im );
+}
+
+// ...
+
+// Register a Node-API module:
+STDLIB_MATH_BASE_NAPI_MODULE_DZ_Z( mul );
+```
+
+The macro expects the following arguments:
+
+-   **fcn**: `stdlib_complex128_t (*fcn)( double, stdlib_complex128_t )` binary function.
+
+When used, this macro should be used **instead of** `NAPI_MODULE`. The macro includes `NAPI_MODULE`, thus ensuring Node-API module registration.
+
+#### stdlib_math_base_napi_dz_z( env, info, fcn )
+
+Invokes a binary function accepting a double-precision floating-point number and a double-precision complex floating-point number and returning a double-precision complex floating-point number.
+
+```c
+#include "stdlib/complex/float64/ctor.h"
+#include "stdlib/complex/float64/reim.h"
+#include <node_api.h>
+
+// ...
+
+static stdlib_complex128_t mul( const double y, const stdlib_complex128_t x ) {
+    double xre;
+    double xim;
+    double re;
+    double im;
+
+    stdlib_complex128_reim( x, &xre, &xim );
+
+    re = xre * y;
+    im = xim * y;
+
+    return stdlib_complex128( re, im );
+}
+
+// ...
+
+/**
+* Receives JavaScript callback invocation data.
+*
+* @param env    environment under which the function is invoked
+* @param info   callback data
+* @return       Node-API value
+*/
+napi_value addon( napi_env env, napi_callback_info info ) {
+    return stdlib_math_base_napi_dz_z( env, info, mul );
+}
+
+// ...
+```
+
+The function accepts the following arguments:
+
+-   **env**: `[in] napi_env` environment under which the function is invoked.
+-   **info**: `[in] napi_callback_info` callback data.
+-   **fcn**: `[in] stdlib_complex128_t (*fcn)( double, stdlib_complex128_t )` binary function.
+
+```c
+void stdlib_math_base_napi_dz_z( napi_env env, napi_callback_info info, stdlib_complex128_t (*fcn)( double, stdlib_complex128_t ) );
+```
+
 #### STDLIB_MATH_BASE_NAPI_MODULE_FF_F( fcn )
 
 Macro for registering a Node-API module exporting an interface for invoking a binary function accepting and returning single-precision floating-point numbers.