RFR: 8340229: Improve opening sentence of FileInputStream constructor specification [v2]

[Brian Burkhalter]

> Improve the first sentences of the three `FileInputStream` constructors, in particular removing the term "connection."

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8340229: Revert FIS(fdObj) change

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21223/files
  - new: https://git.openjdk.org/jdk/pull/21223/files/9dd615a3..d345bce5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21223&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21223&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21223.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21223/head:pull/21223

PR: https://git.openjdk.org/jdk/pull/21223