chore: remove git.io

All links on git.io will stop redirecting after April 29, 2022.

- https://github.blog/changelog/2022-04-25-git-io-deprecation/

Pull Request resolved: https://github.com/pytorch/pytorch/pull/76426
Approved by: https://github.com/ngimel
diff --git a/tools/linter/adapters/clangtidy_linter.py b/tools/linter/adapters/clangtidy_linter.py
index 9fc0b32..d7e1945 100644
--- a/tools/linter/adapters/clangtidy_linter.py
+++ b/tools/linter/adapters/clangtidy_linter.py
@@ -86,7 +86,8 @@
         logging.debug("took %dms", (end_time - start_time) * 1000)
 
 
-# Severity is either "error" or "note": https://git.io/JiLOP
+# Severity is either "error" or "note":
+# https://github.com/python/mypy/blob/8b47a032e1317fb8e3f9a818005a6b63e9bf0311/mypy/errors.py#L46-L47
 severities = {
     "error": LintSeverity.ERROR,
     "warning": LintSeverity.WARNING,
diff --git a/tools/linter/adapters/mypy_linter.py b/tools/linter/adapters/mypy_linter.py
index 95cb1e0..65ee885 100644
--- a/tools/linter/adapters/mypy_linter.py
+++ b/tools/linter/adapters/mypy_linter.py
@@ -75,7 +75,8 @@
         logging.debug("took %dms", (end_time - start_time) * 1000)
 
 
-# Severity is either "error" or "note": https://git.io/JiLOP
+# Severity is either "error" or "note":
+# https://github.com/python/mypy/blob/8b47a032e1317fb8e3f9a818005a6b63e9bf0311/mypy/errors.py#L46-L47
 severities = {
     "error": LintSeverity.ERROR,
     "note": LintSeverity.ADVICE,