RFR: 8157729: examples in LinkedHashMap and LinkedHashSet class doc use raw types

[Naoto Sato]

On Tue, 8 Sep 2020 22:32:47 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Add some generics and wrap in `{@code}` to protect angle brackets.

Marked as reviewed by naoto (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/87