RFR: JDK-8276649: MethodHandles.Lookup docs: table could be list

[Ludvig Janiuk]

Inferring from the flow of the text, the table should have been a list all along, so I've made it that way. Before and after for comparison:
![image](https://user-images.githubusercontent.com/6298393/140376551-6f8ac0c9-5336-4da0-8504-01af806ecae0.png)
![image](https://user-images.githubusercontent.com/6298393/140376679-54716d82-f431-46f7-b959-022374b6f893.png)

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Commit messages:
 - Oops, trailing whitespace
 - Single column table -> list

Changes: https://git.openjdk.java.net/jdk/pull/6260/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6260&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276649
  Stats: 34 lines in 1 file changed: 0 ins; 20 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6260.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6260/head:pull/6260

PR: https://git.openjdk.java.net/jdk/pull/6260