Ignore GH file line-range during link-check

Allows link in simple repo API spec

Author: EpicWink

source/conf.py

@@ -108,6 +108,10 @@
     # https://github.com/pypa/packaging.python.org/pull/1308#issuecomment-1775347690
     "https://www.breezy-vcs.org/*",
 ]
+linkcheck_anchors_ignore = [
+    "^!",  # default
+    r"L\d+(-L\d+)?",  # GitHub file line (range) references
+]
 linkcheck_retries = 5
 
 # -- Options for extlinks ----------------------------------------------------------