📝 updated documentation

doc/examples/json_pointer__back.cpp

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+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // different JSON Pointers
+    json::json_pointer ptr1("/foo");
+    json::json_pointer ptr2("/foo/0");
+
+    // call empty()
+    std::cout << "last reference token of " << ptr1 << " is " << ptr1.back() << '\n'
+              << "last reference token of " << ptr2 << " is " << ptr2.back() << std::endl;
+}

doc/examples/json_pointer__back.link

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+<a target="_blank" href="https://wandbox.org/permlink/2q7gu0ZAQoMeOaAc"><b>online</b></a>

doc/examples/json_pointer__back.output

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+last reference token of "/foo" is foo
+last reference token of "/foo/0" is 0

doc/examples/json_pointer__pop_back.cpp

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+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create empty JSON Pointer
+    json::json_pointer ptr("/foo/bar/baz");
+    std::cout << ptr << '\n';
+
+    // call pop_back()
+    ptr.pop_back();
+    std::cout << ptr << '\n';
+
+    ptr.pop_back();
+    std::cout << ptr << '\n';
+
+    ptr.pop_back();
+    std::cout << ptr << '\n';
+}

doc/examples/json_pointer__pop_back.link

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+<a target="_blank" href="https://wandbox.org/permlink/aFuDbxgbraVszcBX"><b>online</b></a>

doc/examples/json_pointer__pop_back.output

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+"/foo/bar/baz"
+"/foo/bar"
+"/foo"
+""