Improved documentation for linkcheck parameter

doc/en/conf.py

@@ -112,14 +112,15 @@
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
 
-# A list of links to be ignored by linkcheck builder
+# A list of regular expressions that match URIs that should not be checked when doing a linkcheck
+# see https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-the-linkcheck-builder
 linkcheck_ignore = [
     "https://github.com/numpy/numpy/blob/master/doc/release/1.16.0-notes.rst#new-deprecations",
     "https://blogs.msdn.microsoft.com/bharry/2017/06/28/testing-in-a-cloud-delivery-cadence/",
     "http://pythontesting.net/framework/pytest-introduction/",
 ]
 
-# Number of parallel worker checking links
+# The number of worker threads to use when checking links
 linkcheck_workers = 20