Fix escape character in changelog for Go query

Author: coadaflorin

docs/codeql/codeql-overview/codeql-changelog/codeql-cli-2.23.1.rst

@@ -126,7 +126,7 @@ Golang
 """"""
 
 *   The second argument of the :code:`CreateTemp` function, from the :code:`os` package, is no longer a path-injection sink due to proper sanitization by Go.
-*   The query "Uncontrolled data used in path expression" (:code:`go/path-injection`) now detects sanitizing a path by adding :code:`os.PathSeparator` or :code:`\` to the beginning.
+*   The query "Uncontrolled data used in path expression" (:code:`go/path-injection`) now detects sanitizing a path by adding :code:`os.PathSeparator` or :code:`\\` to the beginning.
 
 Java/Kotlin
 """""""""""