.github/workflows/test.yml: Add comment

Author: Ed (ODSC)

.github/workflows/test.yml

@@ -8,6 +8,7 @@ jobs:
     strategy:
       matrix:
         python-version: [  '3.8', '3.9', '3.10', '3.11']
+        # Removed testing of myst-parser-version<0.18.0
         myst-parser-version: [ '>=0.18.0,<0.19', '>=0.19.0,<1.0', '>=1.0.0,<2', '>=2.0.0,<3']
         jsonref-version: [">1"]
         include: