Changes imported from Abseil "staging" branch:

- 1dde8a2a1868c32b32d62fba62eb37974f656948 Correct usage of CUnescape() in example. by Abseil Team <absl-team@google.com>

GitOrigin-RevId: 1dde8a2a1868c32b32d62fba62eb37974f656948
Change-Id: I5183a74a3c682ac55b2bf4be0d871375e1302aae

absl/strings/escaping.h

@@ -64,7 +64,10 @@ namespace absl {
 // Example:
 //
 //   std::string s = "foo\\rbar\\nbaz\\t";
-//   std::string unescaped_s = absl::CUnescape(s);
+//   std::string unescaped_s;
+//   if (!absl::CUnescape(s, &unescaped_s) {
+//     ...
+//   }
 //   EXPECT_EQ(unescaped_s, "foo\rbar\nbaz\t");
 bool CUnescape(absl::string_view source, std::string* dest, std::string* error);