[clang-tools-extra] [NFC] [clang-tidy] [doc] document gtest support of statusor check (PR #180662)

[Florian Mayer via cfe-commits]

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@@ -104,6 +104,46 @@ is ok. For example:
      use(*x);
    }
 
+Ensuring that the status is ok using googletest macros
+------------------------------------------------------
+
+The check is aware of ``googletest`` (or ``gtest``) macros and matchers.
+Accessing the value of a ``StatusOr<T>`` object is considered safe if it
+is preceded by an ``ASSERT_`` macro that ensures the status is ok.
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fmayer wrote:

I don't think it does.

https://github.com/llvm/llvm-project/pull/180662