docs: update links

[Wwwsylvia]

Resolves: #554

[codecov-commenter]

Codecov Report

Merging #563 (8b7fb37) into main (6ec43e7) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #563      +/-   ##
==========================================
- Coverage   74.19%   73.98%   -0.22%     
==========================================
  Files          50       50              
  Lines        4732     4732              
==========================================
- Hits         3511     3501      -10     
- Misses        896      904       +8     
- Partials      325      327       +2     

Files Changed	Coverage Δ
content/oci/oci.go	75.28% <ø> (ø)
content/oci/readonlyoci.go	73.52% <ø> (ø)
content/oci/readonlystorage.go	87.50% <ø> (ø)
content/oci/storage.go	61.64% <ø> (ø)
registry/reference.go	68.42% <ø> (ø)
registry/remote/referrers.go	91.95% <ø> (ø)
registry/remote/registry.go	67.41% <ø> (ø)
registry/remote/url.go	100.00% <ø> (ø)
registry/repository.go	66.66% <ø> (ø)
registry/remote/repository.go	70.90% <100.00%> (ø)

... and 1 file with indirect coverage changes

[shizhMSFT]

LGTM