Googletest export

Update the `DescribeTo` signature in the code example at the Writing New Polymorphic Matchers section in gmock_cook_book. `os` should be a pointer to be consistent with the implementation, which dereference it as `*os`. PiperOrigin-RevId: 370693387

Googletest export
719fd2d3 · Abseil Team · Derek Mauro · 6e8a8623 · 719fd2d3
Commit 719fd2d3 authored Apr 27, 2021 by Abseil Team Committed by Derek Mauro Apr 29, 2021
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--- a/docs/gmock_cook_book.md
+++ b/docs/gmock_cook_book.md
@@ -3696,7 +3696,7 @@ class NotNullMatcher {
  }
  // Describes the property of a value matching this matcher.
-  void DescribeTo(std::ostream& os) const { *os << "is not NULL"; }
+  void DescribeTo(std::ostream* os) const { *os << "is not NULL"; }
  // Describes the property of a value NOT matching this matcher.
  void DescribeNegationTo(std::ostream* os) const { *os << "is NULL"; }