Fixing check block and custom conditions redirects (#1209)

Author: rkoron007

content/terraform-docs-common/redirects.jsonc

@@ -543,6 +543,28 @@
     "destination": "/terraform/language/v:version/validate",
     "permanent": true
   },
+  // Custom conditions → validate
+  {
+    "source": "/terraform/language/expressions/custom-conditions",
+    "destination": "/terraform/language/validate",
+    "permanent": true
+  },
+  {
+     "source": "/terraform/language/v:version(1\\.(?:[1-9]|1[01])\\.x)/validate",
+    "destination": "/terraform/language/v:version/expressions/custom-conditions",
+    "permanent": true
+  },
+  {
+    "source": "/terraform/language/v:version((?:1\\.(?:1[2-9]|[2-9]\\d)|[2-9]\\d*\\.\\d+)\\.x)/expressions/custom-conditions",
+    "destination": "/terraform/language/v:version/validate",
+    "permanent": true
+  },
+  // Catch reference page going backwards
+  {
+    "source": "/terraform/language/v:version(1\\.(?:[1-9]|1[01])\\.x)/block/check",
+    "destination": "/terraform/language/v:version/checks",
+    "permanent": true
+  },
   // values → parameterize
   {
     "source": "/terraform/language/values",