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docs: update ImageMagick Usage filter links in resamplers - #3171

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docs: update ImageMagick Usage filter links in resamplers#3171
FirmaSpring wants to merge 1 commit into
SixLabors:mainfrom
FirmaSpring:docs/fix-imagemagick-usage-links

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Problem

Cubic and Welch resampler XML docs still cite the retired ImageMagick Usage host:

http://www.imagemagick.org/Usage/filter/

GET with redirects returns 404. The same pages now live at https://usage.imagemagick.org/filter/.

Solution

Update the see hrefs in CubicResampler and WelchResampler to the current Usage site, keeping the original #cubic_bc and #robidoux fragments.

Verification

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "http://www.imagemagick.org/Usage/filter/"
# 404

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "https://usage.imagemagick.org/filter/"
# 200

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "https://usage.imagemagick.org/filter/#cubic_bc"
# 200

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "https://usage.imagemagick.org/filter/#robidoux"
# 200

## Problem

Cubic and Welch resampler XML docs still cite the retired ImageMagick Usage host:

http://www.imagemagick.org/Usage/filter/

GET with redirects returns 404. The same pages now live at https://usage.imagemagick.org/filter/.

## Solution

Update the `see` hrefs in `CubicResampler` and `WelchResampler` to the current Usage site, keeping the original `#cubic_bc` and `#robidoux` fragments.

## Verification

```
curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "http://www.imagemagick.org/Usage/filter/"
# 404

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "https://usage.imagemagick.org/filter/"
# 200

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "https://usage.imagemagick.org/filter/#cubic_bc"
# 200

curl -sL -o /dev/null -w "%{http_code}" -A "Mozilla/5.0" \
  "https://usage.imagemagick.org/filter/#robidoux"
# 200
```

Co-authored-by: FirmamentalSpring <287222957+FirmaSpring@users.noreply.github.com>
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