Use self-documenting option instead of cryptic option

@mateuszz0000 Your review, please.  Pretend that you do not know what `-L` stands for.  How many keystrokes and clicks does it take to confirm the purpose of this option?

Author: cclauss

.github/workflows/codespell.yml

@@ -11,7 +11,7 @@ jobs:
       - run: pip install codespell flake8
       - run: |
           SKIP="./.*,./other/dictionary.txt,./other/words,./project_euler/problem_22/p022_names.txt"
-          codespell -L ans,fo,hist,iff,secant,tim --skip=$SKIP --quiet-level=2
+          codespell --ignore-words-list=ans,fo,hist,iff,secant,som,tim --skip=$SKIP --quiet-level=2
       - name: Codespell comment
         if: ${{ failure() }}
         uses: plettich/python_codespell_action@master