Generate MultipleTEnumValues documentation

manual/cops.md

@@ -29,6 +29,7 @@ In the following section you find all available cops:
 * [Sorbet/IgnoreSigil](cops_sorbet.md#sorbetignoresigil)
 * [Sorbet/ImplicitConversionMethod](cops_sorbet.md#sorbetimplicitconversionmethod)
 * [Sorbet/KeywordArgumentOrdering](cops_sorbet.md#sorbetkeywordargumentordering)
+* [Sorbet/MultipleTEnumValues](cops_sorbet.md#sorbetmultipletenumvalues)
 * [Sorbet/ObsoleteStrictMemoization](cops_sorbet.md#sorbetobsoletestrictmemoization)
 * [Sorbet/OneAncestorPerLine](cops_sorbet.md#sorbetoneancestorperline)
 * [Sorbet/RedundantExtendTSig](cops_sorbet.md#sorbetredundantextendtsig)

manual/cops_sorbet.md

@@ -639,6 +639,33 @@ sig { params(b: String, a: Integer).void }
 def foo(b:, a: 1); end
 ```
 
+## Sorbet/MultipleTEnumValues
+
+Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
+--- | --- | --- | --- | ---
+Enabled | Yes | No | 0.8.2 | -
+
+Disallow creating a `T::Enum` with less than two values.
+
+### Examples
+
+```ruby
+# bad
+class ErrorMessages < T::Enum
+  enums do
+    ServerError = new("There was a server error.")
+  end
+end
+
+# good
+class ErrorMessages < T::Enum
+  enums do
+    ServerError = new("There was a server error.")
+    NotFound = new("The resource was not found.")
+  end
+end
+```
+
 ## Sorbet/ObsoleteStrictMemoization
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged