Update py::kwargs examples to pass by reference (#3038)

docs/advanced/functions.rst

diff --git a/docs/advanced/functions.rst b/docs/advanced/functions.rst
index f6061ff..d880008 100644
--- a/docs/advanced/functions.rst
+++ b/docs/advanced/functions.rst
@@ -254,7 +254,7 @@
 
 .. code-block:: cpp
 
-    void print_dict(py::dict dict) {
+    void print_dict(const py::dict& dict) {
         /* Easily interact with Python types */
         for (auto item : dict)
             std::cout << "key=" << std::string(py::str(item.first)) << ", "
@@ -292,7 +292,7 @@
 
 .. code-block:: cpp
 
-   void generic(py::args args, py::kwargs kwargs) {
+   void generic(py::args args, const py::kwargs& kwargs) {
        /// .. do something with args
        if (kwargs)
            /// .. do something with kwargs