Help: Format add_library documented list of INTERFACE commands

Use a bullet list to make it easier to read.

Help/command/add_library.rst

@@ -133,14 +133,17 @@ Creates an :ref:`Interface Library <Interface Libraries>`.  An ``INTERFACE``
 library target does not directly create build output, though it may
 have properties set on it and it may be installed, exported and
 imported. Typically the ``INTERFACE_*`` properties are populated on
-the interface target using the :command:`set_property`,
-:command:`target_link_libraries(INTERFACE)`,
-:command:`target_include_directories(INTERFACE)`,
-:command:`target_compile_options(INTERFACE)`,
-:command:`target_compile_definitions(INTERFACE)`,
-and :command:`target_sources(INTERFACE)` commands, and then it
-is used as an argument to :command:`target_link_libraries` like any other
-target.
+the interface target using the commands:
+
+* :command:`set_property`,
+* :command:`target_link_libraries(INTERFACE)`,
+* :command:`target_include_directories(INTERFACE)`,
+* :command:`target_compile_options(INTERFACE)`,
+* :command:`target_compile_definitions(INTERFACE)`, and
+* :command:`target_sources(INTERFACE)`,
+
+and then it is used as an argument to :command:`target_link_libraries`
+like any other target.
 
 An ``INTERFACE`` :ref:`Imported Target <Imported Targets>` may also be
 created with this signature.  An ``IMPORTED`` library target references a