ko: update web/glossary-p

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1. pac [ko]: add index.md for web/glossary/pac #16185
2. packet [ko]: add index.md for web/glossary/packet #16187
3. page_load_time [ko]: add index.md for web/glossary/page_load_time #16188
4. page_prediction [ko]: add index.md for web/glossary/page_prediction #16189
5. parameter [ko]: add index.md for web/glossary/parameter #16190
6. parent_object [ko]: add index.md for web/glossary/parent_object #16192
7. parse [ko]: add index.md for web/glossary/parse #16193
8. parser [ko]: add index.md for web/glossary/parser #16194
9. payload_body [ko]: add index.md for web/glossary/payload_body #16195
10. payload_header [ko]: add index.md for web/glossary/payload_header #16198
11. pdf [ko]: revise index.md files for web/glossary/p #15475
12. perceived_performance [ko]: add index.md for web/glossary/perceived_performance #16200
13. percent-encoding [ko]: revise index.md files for web/glossary/p #15475
14. php [ko]: revise index.md files for web/glossary/p #15475
15. pixel [ko]: revise index.md files for web/glossary/p #15475
16. placeholder_names [ko]: add index.md for web/glossary/placeholder_names #16202
17. plaintext [ko]: add index.md for web/glossary/plaintext #16204
18. plugin [ko]: add index.md for web/glossary/plugin #16206
19. png [ko]: revise index.md files for web/glossary/p #15475
20. polyfill [ko]: revise index.md files for web/glossary/p #15475
21. polymorphism [ko]: add index.md for web/glossary/polymorphism #16207
22. pop [ko]: add index.md for web/glossary/pop #16212
23. port [ko]: add index.md for web/glossary/port #16213
24. prefetch [ko]: add index.md for web/glossary/prefetch #16214
25. preflight_request [ko]: revise index.md files for web/glossary/p #15475
26. prerender [ko]: add index.md for web/glossary/prerender #16215
27. presto [ko]: add index.md for wweb/glossary/presto #16216
28. primitive [ko]: revise index.md files for web/glossary/p #15475
29. privileged [ko]: add index.md for web/glossary/privileged #16217
30. privileged_code [ko]: add index.md for web/glossary/privileged_code #16218
31. progressive_enhancement [ko]: revise index.md files for web/glossary/p #15475
32. progressive_web_apps [ko]: add index.md for web/glossary/progressive_web_apps #16219
33. promise [ko]: add index.md for web/glossary/promise #16223
34. property [ko]: revise index.md files for web/glossary/p #15475
35. protocol [ko]: revise index.md files for web/glossary/p #15475
36. prototype [ko]: revise index.md files for web/glossary/p #15475
37. prototype-based_programming [ko]: revise index.md files for web/glossary/p #15475
38. proxy_server [ko]: revise index.md files for web/glossary/p #15475
39. pseudo-class [ko]: add index.md for web/glossary/pseudo-class #16220
40. pseudo-element [ko]: add index.md for web/glossary/pseudo-element #16221
41. pseudocode [ko]: revise index.md files for web/glossary/p #15475
42. public-key_cryptography [ko]: add index.md for web/glossary/public-key_crpytography #16222
43. python [ko]: add index.md for web/glossary/python #16224