Googletest export

Adding std:: namespace to string in the example

PiperOrigin-RevId: 320327910

googletest/docs/advanced.md

@@ -1490,7 +1490,7 @@ for conciseness:
 ```c++
 enum class MyType { MY_FOO = 0, MY_BAR = 1 };
 
-class MyTestSuite : public testing::TestWithParam<std::tuple<MyType, string>> {
+class MyTestSuite : public testing::TestWithParam<std::tuple<MyType, std::string>> {
 };
 
 INSTANTIATE_TEST_SUITE_P(
@@ -1499,7 +1499,7 @@ INSTANTIATE_TEST_SUITE_P(
         testing::Values(MyType::VALUE_0, MyType::VALUE_1),
         testing::ValuesIn("", "")),
     [](const testing::TestParamInfo<MyTestSuite::ParamType>& info) {
-      string name = absl::StrCat(
+      std::string name = absl::StrCat(
           std::get<0>(info.param) == MY_FOO ? "Foo" : "Bar", "_",
           std::get<1>(info.param));
       absl::c_replace_if(name, [](char c) { return !std::isalnum(c); }, '_');