document uninit issue

Summary: title

Reviewed By: ezgicicek

Differential Revision: D22045454

fbshipit-source-id: eb3e907d3

infer/documentation/issues/UNINITIALIZED_VALUE.md

@@ -0,0 +1,19 @@
+A value is read before it has been initialized. For example, in C:
+
+```C
+struct coordinates {
+  int x;
+  int y;
+};
+
+void foo() {
+  struct coordinates c;
+  c.x = 42;
+  c.y++; // uninitialized value c.y!
+
+  int z;
+  if (z == 0) { // uninitialized value z!
+    // something
+  }
+}
+```

infer/src/base/IssueType.ml

@@ -927,7 +927,10 @@ let _unavailable_api_in_supported_ios_sdk =
     ~user_documentation:[%blob "../../documentation/issues/UNAVAILABLE_API_IN_SUPPORTED_IOS_SDK.md"]
 
 
-let uninitialized_value = register_from_string ~id:"UNINITIALIZED_VALUE" Error Uninit
+let uninitialized_value =
+  register_from_string ~id:"UNINITIALIZED_VALUE" Error Uninit
+    ~user_documentation:[%blob "../../documentation/issues/UNINITIALIZED_VALUE.md"]
+
 
 let unreachable_code_after =
   register_from_string ~id:"UNREACHABLE_CODE" Error BufferOverrunChecker