Merge pull request numpy#19902 from HaoZeke/refgfix_ignore

BUG,DOC: Ignore upcoming_changes from refguide

Author: melissawm

tools/refguide_check.py

@@ -118,6 +118,7 @@
     'changelog',
     'doc/release',
     'doc/source/release',
+    'doc/release/upcoming_changes',
     'c-info.ufunc-tutorial.rst',
     'c-info.python-as-glue.rst',
     'f2py.getting-started.rst',