docs: fix missing declaration

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

Author: kgryte

lib/node_modules/@stdlib/dstructs/named-typed-tuple/docs/repl.txt

@@ -1395,7 +1395,7 @@ tuple.toString()
 
     Examples
     --------
-    > opts = { 'name': 'Point' };
+    > var opts = { 'name': 'Point' };
     > var factory = {{alias}}( [ 'x', 'y', 'z' ], opts );
     > var p = factory( [ 1.0, -1.0, 0.0 ] );
     > p.toString()