docs: Lowercase "image" URL

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
Should not be capitalised.

Status and versioning classification:

• This PR only includes non-code changes, like changes to documentation, README, etc.

[vercel]

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2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
discord-js	⬜️ Ignored (Inspect)	Visit Preview		Jul 28, 2024 1:38pm
discord-js-guide	⬜️ Ignored (Inspect)	Visit Preview		Jul 28, 2024 1:38pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.63%. Comparing base (6b38335) to head (77255e1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10386      +/-   ##
==========================================
- Coverage   50.77%   50.63%   -0.14%     
==========================================
  Files         228      228              
  Lines       20662    20514     -148     
  Branches     1255     1238      -17     
==========================================
- Hits        10491    10388     -103     
+ Misses      10127    10082      -45     
  Partials       44       44              

Flag	Coverage Δ
collection	100.00% <ø> (ø)
proxy	78.52% <ø> (ø)
rest	92.68% <ø> (ø)

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