Help: Fix versionadded indentation in cmake-generator-expressions(7) manual

Fix indentation of the `versionadded` markup added by commit 634079b86d
(cmGeneratorExpressionEvaluator: Short-circuit boolean operators,
2023-09-11) to render the note in the appropriate scope.

Help/manual/cmake-generator-expressions.7.rst

@@ -195,7 +195,7 @@ Two forms of conditional generator expressions are supported:
   if ``condition`` is ``0``.  Any other value for ``condition`` results in an
   error.
 
-    .. versionadded:: 3.28
+  .. versionadded:: 3.28
 
     This generator expression short-circuits such that generator expressions in
     ``false_string`` will not evaluate when ``condition`` is ``1``, and generator
@@ -258,7 +258,7 @@ The common boolean logic operators are supported:
   ``condition`` must be ``0`` or ``1``.  The result of the expression is
   ``0`` if ``condition`` is ``1``, else ``1``.
 
-  .. versionadded:: 3.28
+.. versionadded:: 3.28
 
   Logical operators short-circuit such that generator expressions in the
   arguments list will not be evaluated once a return value can be determined.