Add Explanations about Single and Multiple Patterns

[y-matsutomo]

Description

I added explanations about single and multiple patterns.

Checklist

• [x] I opened a draft PR or added the [WIP] to the title if my PR is not ready for review.
• [x] I have reviewed the code by myself.
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] I have made corresponding changes to the documentation.
• [ ] I have added tests enough to show how your code behaves and that your code works as expected.

Additional Notes

The relationships between each page on each PR are reviewed but if you find any errors and suggestions, please inform me. I will fix them.

Thanks,

[netlify[bot]]

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[codecov-commenter]

Codecov Report

Merging #108 (5d26928) into main (5b4894b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   75.14%   75.14%           
=======================================
  Files          31       31           
  Lines        1718     1718           
=======================================
  Hits         1291     1291           
  Misses        427      427           

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