docs(gitleaks): improve descriptions for allowlisted credentials

Author: mrz1836

.github/.gitleaks.toml

@@ -13,16 +13,32 @@ description = "Ignore test/example credentials with gitleaks:allow comment"
 regexTarget = "line"
 regex = '''gitleaks:allow'''
 
-# Allowlist specific test credential
+# Allowlist specific test credentials
 [[rules.allowlist]]
-description = "Test WIF credential used in examples and fixtures"
+description = "Test WIF credential (serverWIF) used in examples and fixtures"
 regexTarget = "match"
 regex = '''L1cReZseWmqcYra3vrqj9TPBGHhvDQFD2jYuu1RUj5rrfpVLiKHs'''
 
+[[rules.allowlist]]
+description = "Test private key hex (clientPrivHex/alicePrivKey) used in examples and regression tests"
+regexTarget = "match"
+regex = '''143ab18a84d3b25e1a13cefa90038411e5d2014590a2a4a57263d1593c8dee1c'''
+
+[[rules.allowlist]]
+description = "Historical test WIF credential - no longer in use but in git history"
+regexTarget = "match"
+regex = '''L268WKbTbLTrZL6aW5A5rzd4'''
+
+[[rules.allowlist]]
+description = "Historical test public key - no longer in use but in git history"
+regexTarget = "match"
+regex = '''0279be667ef9dcbbac55a062'''
+
 # Allowlist paths for test fixtures and examples
 [[rules.allowlist]]
-description = "Ignore credentials in test fixtures"
+description = "Ignore credentials in test fixtures, examples, and regression tests"
 paths = [
     '''pkg/internal/testabilities/fixture/.*''',
+    '''pkg/internal/regressiontests/.*''',
     '''examples/.*''',
 ]