Help: Fix indenting within TARGET_RUNTIME_DLLS genex docs

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

@@ -2267,9 +2267,9 @@ In the following, the phrase "the ``tgt`` filename" means the name of the
     section for details.  Many :ref:`Find Modules` produce imported targets
     with the ``UNKNOWN`` type and therefore will be ignored.
 
-On platforms that support runtime paths (``RPATH``), refer to the
-:prop_tgt:`INSTALL_RPATH` target property.
-On Apple platforms, refer to the :prop_tgt:`INSTALL_NAME_DIR` target property.
+  On platforms that support runtime paths (``RPATH``), refer to the
+  :prop_tgt:`INSTALL_RPATH` target property.
+  On Apple platforms, refer to the :prop_tgt:`INSTALL_NAME_DIR` target property.
 
 .. genex:: $<TARGET_RUNTIME_DLL_DIRS:tgt>