style: align math/iter/sequences/nonfibonacci with namespace conventions

Add missing `integer`, `int`, and `number` keywords (present in 77% of
sibling packages in `math/iter/sequences`).

Author: claude

lib/node_modules/@stdlib/math/iter/sequences/nonfibonacci/package.json

@@ -56,6 +56,9 @@
     "fibonacci",
     "fibo",
     "fib",
+    "integer",
+    "int",
+    "number",
     "sequence",
     "iterator",
     "iterate",