Doc comment applied to all components of dotted namespace declaration

TypeScript Version: 2.1.5, 2.2-rc

Code

/** Performance measurements for the compiler. */
namespace ts.performance {}

Expected behavior:
The doc comment should show up in quickinfo/completion for references to the innermost declared namespace performance, but not for ts.

Actual behavior:
The doc comment appears in quickinfo/completion for references to both performance and ts, even though for the outer namespace ts it's most likely irrelevant:

首先使用 TypeScript 2.1.5 或 2.2-rc 重现点号命名空间示例，然后跟踪外层和最内层命名空间引用的 quickinfo 和 completion 入口点。完成标准是：在 quickinfo 和 completion 中，注释会出现在 performance 上，但不会出现在 ts 上。