RESTOptions: (really) small description update for cdn

[volcanofr]

Please describe the changes this PR makes and why it should be merged:

I just add "``" to uniform cdn @DefaultValue with others one (like api). The link is not broken anymore, because it do not work anymore.

Status and versioning classification:

• This PR only includes non-code changes

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Codecov Report

Merging #9615 (cd90ef8) into main (1ab60f9) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head cd90ef8 differs from pull request most recent head 83508a8. Consider uploading reports for the commit 83508a8 to get more accurate results

@@            Coverage Diff             @@
##             main    #9615      +/-   ##
==========================================
- Coverage   58.19%   58.17%   -0.03%     
==========================================
  Files         227      227              
  Lines       14904    14892      -12     
  Branches     1131     1131              
==========================================
- Hits         8673     8663      -10     
+ Misses       6191     6189       -2     
  Partials       40       40              

Flag	Coverage Δ
proxy	76.31% <ø> (ø)
rest	93.18% <100.00%> (+0.04%)	⬆️
ws	53.86% <ø> (ø)

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Impacted Files	Coverage Δ
packages/rest/src/lib/REST.ts	98.91% <100.00%> (ø)

... and 2 files with indirect coverage changes

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