fix: linkcheck for ci to ignore scaleway anchor URL (canonical#4793)

Commit ce07818 introduced new doc links for Scaleway datasource.
Ignore anchors which sphinx linkcheck cannot parse.

Fixes CI linkcheck failures.

doc/rtd/conf.py

@@ -131,6 +131,7 @@
 linkcheck_ignore = [
     r"http://\[fd00:ec2::254.*",
     r"http://instance-data.*",
+    r"https://www.scaleway.com/en/developers/api/instance.*",
     r"https://powersj.io.*",
     r"http://169.254.169.254.*",
     r"http://10.10.0.1.*",