Googletest export

Fix code in googletest parameterized name example. PiperOrigin-RevId: 373262838

Googletest export
d69a1129 · Abseil Team · CJ Johnson · 97f96cbc · d69a1129
Commit d69a1129 authored May 11, 2021 by Abseil Team Committed by CJ Johnson May 13, 2021
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--- a/docs/advanced.md
+++ b/docs/advanced.md
@@ -1537,7 +1537,7 @@ INSTANTIATE_TEST_SUITE_P(
      std::string name = absl::StrCat(
          std::get<0>(info.param) == MyType::MY_FOO ? "Foo" : "Bar",
          std::get<1>(info.param));
-      absl::c_replace_if(name, [](char c) { return !std::isalnum(c); }, '');
+      absl::c_replace_if(name, [](char c) { return !std::isalnum(c); }, '_');
      return name;
    });
 ```