ko: update web/glossary-m

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1. main_axis [ko]: revise files for web/glossary-m #15343
2. main_thread [ko]: add index.md for web/glossary/main_thread #16125
3. markup [ko]: add index.md for web/glossary/markup #16126
4. mathml [ko]: add index.md for web/glossary/mathml #16127
5. media [ko]: add index.md for web/glossary/media #16128
6. metadata [ko]: revise files for web/glossary-m #15343
7. method [ko]: revise files for web/glossary-m #15343
8. microsoft_edge [ko]: revise files for web/glossary-m #15343
9. microsoft_internet_explorer [ko]: revise files for web/glossary-m #15343
10. middleware [ko]: add index.md for web/glossary/middleware #16131
11. mime [ko]: add index.md for web/glossary/mime #16132
12. mime_type [ko]: revise files for web/glossary-m #15343
13. minification [ko]: add index.md for web/glossary/minification #16134
14. mitm [ko]: add index.md for web/glossary/mitm #16135
15. mixin [ko]: add index.md for web/glossary/mixin #16136
16. mobile_first [ko]: add index.md for web/glossary/mobile_first #16138
17. modem [ko]: add index.md for web/glossary/modem #16139
18. modularity [ko]: add index.md for web/glossary/modularity #16140
19. mozilla_firefox [ko]: revise files for web/glossary-m #15343
20. mutable [ko]: revise files for web/glossary-m #15343
21. mvc [ko]: revise files for web/glossary-m #15343