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[cpp-docs] Fix 404 link in guards library doc.

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docs/codeql/codeql-language-guides/using-the-guards-library-in-cpp.rst
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@@ -8,7 +8,7 @@ You can use the CodeQL guards library to identify conditional expressions that c
About the guards library
------------------------
The guards library (defined in ``semmle.code.cpp.controlflow.Guards``) provides a class `GuardCondition <https://codeql.github.com/codeql-standard-libraries/cpp/semmle/code/cpp/controlflow/Guards.qll/type.Guards$GuardCondition.html>`__ representing Boolean values that are used to make control flow decisions.
The guards library (defined in ``semmle.code.cpp.controlflow.Guards``) provides a class `GuardCondition <https://codeql.github.com/codeql-standard-libraries/cpp/semmle/code/cpp/controlflow/IRGuards.qll/type.IRGuards$GuardCondition.html>`__ representing Boolean values that are used to make control flow decisions.
A ``GuardCondition`` is considered to guard a basic block if the block can only be reached if the ``GuardCondition`` is evaluated a certain way. For instance, in the following code, ``x < 10`` is a ``GuardCondition``, and it guards all the code before the return statement.
.. code-block:: cpp