Corrected styles in doc

[chryshumble]

• closes Documentation issue for pn.pane.Image and others #7337. fixed the typo error in document files, changed style to styles, they are:
• examples/reference/panes/GIF.ipynb
• examples/reference/panes/Image.ipynb
• examples/reference/panes/JPG.ipynb
• examples/reference/panes/PDF.ipynb
• examples/reference/panes/PNG.ipynb
• examples/reference/panes/SVG.ipynb
• examples/reference/panes/WebP.ipynb

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.20%. Comparing base (5ef8909) to head (6d2ccc5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7371      +/-   ##
==========================================
- Coverage   82.21%   82.20%   -0.01%     
==========================================
  Files         337      337              
  Lines       50513    50513              
==========================================
- Hits        41530    41526       -4     
- Misses       8983     8987       +4     

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[hoxbro]

Thank you for the PR 🥇