Add docstrings for some elements which were missing it.

Thus these elements will appear with the docstring in the generated Rustdoc.

PiperOrigin-RevId: 559074717

Author: hovinenb

googletest/src/matcher.rs

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//! The components required to implement matchers.
+
 use crate::internal::source_location::SourceLocation;
 use crate::internal::test_outcome::TestAssertionFailure;
 use crate::matchers::conjunction_matcher::ConjunctionMatcher;

googletest/src/matchers/contains_matcher.rs

@@ -44,6 +44,8 @@ pub fn contains<T, InnerMatcherT>(inner: InnerMatcherT) -> ContainsMatcher<T, In
     ContainsMatcher { inner, count: None, phantom: Default::default() }
 }
 
+/// A matcher which matches a container containing one or more elements a given
+/// inner [`Matcher`] matches.
 pub struct ContainsMatcher<T, InnerMatcherT> {
     inner: InnerMatcherT,
     count: Option<Box<dyn Matcher<ActualT = usize>>>,