chore: fix typo in README

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Author: anandkaranubc

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

@@ -484,7 +484,7 @@ The function accepts the following arguments:
 -   **fcn**: `[in] double (*fcn)( int32_t )` unary function.
 
 ```c
-void stdlib_math_base_napi_i_i( napi_env env, napi_callback_info info, double (*fcn)( int32_t ) );
+void stdlib_math_base_napi_i_d( napi_env env, napi_callback_info info, double (*fcn)( int32_t ) );
 ```
 
 #### STDLIB_MATH_BASE_NAPI_MODULE_I_F( fcn )