RFR: 8267262: com/sun/net/httpserver/Filter improve API documentation of static methods [v2]

[Julia Boes]

> The filter operation `Consumer` that is passed to the factory methods can throw an unchecked exception. This change adds a note on the exception handling in that case. It also adds a clarification to `Filter::afterHandler` on the relation of the filter operation and the client receiving the response.

Julia Boes has updated the pull request incrementally with one additional commit since the last revision:

  add bug id to test

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4085/files
  - new: https://git.openjdk.java.net/jdk/pull/4085/files/ef8ffbfe..8d3749b7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4085&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4085&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4085.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4085/head:pull/4085

PR: https://git.openjdk.java.net/jdk/pull/4085