[Documentation][Clang] Clang LibASTMatchers tutorial typo fix

[isuckatcs]

Summary

While I was walking through the LibASTMatchers tutorial I noticed that at a code snippet a closing parenthesis ) is missing and in a sentence one words is not needed.

These are not much of an issue but might worth a patch.

[Szelethus]

LGTM

clang/docs/LibASTMatchersTutorial.rst

 ``for`` loop compares a variable against the size of the array. There is
 only one problem - we don't know which array we're iterating over
 without looking at the body of the loop! We are again restricted to
 approximating the result we want with matchers, filling in the details
 in the callback. So we start with:
 
 .. code-block:: c++
 
-      hasCondition(binaryOperator(hasOperatorName("<"))
+      hasCondition(binaryOperator(hasOperatorName("<")))
 
 It makes sense to ensure that the left-hand side is a reference to a
 variable, and that the right-hand side has integer type.
 
 .. code-block:: c++
 
       hasCondition(binaryOperator(
         hasOperatorName("<"),

 .. code-block:: c++
 
       static bool areSameVariable(const ValueDecl *First, const ValueDecl *Second) {
         return First && Second &&
                First->getCanonicalDecl() == Second->getCanonicalDecl();
       }
 
 If execution reaches the end of ``LoopPrinter::run()``, we know that the
-loop shell that looks like
+loop shell looks like
 
 .. code-block:: c++
 
       for (int i= 0; i < expr(); ++i) { ... }
 
 For now, we will just print a message explaining that we found a loop.
 The next section will deal with recursively traversing the AST to
 discover all changes needed.