[clang-tools-extra] [clang-tidy] support string::contains (PR #110351)

[Nicolas van Kempen via cfe-commits]

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@@ -94,12 +102,14 @@ void ContainerContainsCheck::registerMatchers(MatchFinder *Finder) {
       binaryOperator(hasLHS(Literal1), hasOperatorName(">"), hasRHS(CountCall))
           .bind("negativeComparison"));
 
-  // Find membership tests based on `find() == end()`.
+  // Find membership tests based on `find() == end() or find() == npos`.
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nicovank wrote:

```suggestion
  // Find membership tests based on `find() == end()` or `find() == npos`.
```

https://github.com/llvm/llvm-project/pull/110351