Update docs/codeql/codeql-language-guides/analyzing-data-flow-in-javascript-and-typescript.rst

Co-authored-by: Erik Krogh Kristensen <erik-krogh@github.com>

Author: asgerf

docs/codeql/codeql-language-guides/analyzing-data-flow-in-javascript-and-typescript.rst

@@ -366,7 +366,7 @@ The characteristic predicate of this class checks that the sanitizer guard is a
 of ``blocksExpr`` says such a call sanitizes its first argument (that is, ``getArgument(0)``) if it evaluates to ``true`` (or rather, a truthy
 value).
 
-Now we can implement ``isBarrier`` to add this sanitizer guards to our configuration:
+Now we can implement ``isBarrier`` to add this sanitizer guard to our configuration:
 
 .. code-block:: ql