Fix reST formatting in NEWS entry

Author: Erlend E. Aasland

Misc/NEWS.d/next/Build/2021-11-19-15-42-27.bpo-45723.vwIJWI.rst

@@ -1,10 +1,10 @@
 Add ``autoconf`` helpers for saving and restoring environment variables:
 
-- ``SAVE_ENV``: Save ``$CFLAGS``, ``$LDFLAGS``, ``$LIBS``, and
+* ``SAVE_ENV``: Save ``$CFLAGS``, ``$LDFLAGS``, ``$LIBS``, and
   ``$CPPFLAGS``.
-- ``RESTORE_ENV``: Restore ``$CFLAGS``, ``$LDFLAGS``, ``$LIBS``, and
+* ``RESTORE_ENV``: Restore ``$CFLAGS``, ``$LDFLAGS``, ``$LIBS``, and
   ``$CPPFLAGS``.
-- ``WITH_SAVE_ENV([SCRIPT])``: Run ``SCRIPT`` wrapped with ``SAVE_ENV`` and
+* ``WITH_SAVE_ENV([SCRIPT])``: Run ``SCRIPT`` wrapped with ``SAVE_ENV`` and
   ``RESTORE_ENV``.
 
 Patch by Erlend E. Aasland.