RFR: 8268077: java.util.List missing from Collections Framework Overview

[Raffaello Giulietti]

Trivial changes to this non-normative document.

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Commit messages:
 - 8268077: java.util.List missing from Collections Framework Overview

Changes: https://git.openjdk.java.net/jdk/pull/4289/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4289&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268077
  Stats: 7 lines in 1 file changed: 2 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4289.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4289/head:pull/4289

PR: https://git.openjdk.java.net/jdk/pull/4289